Change WooCommerce product price dynamically based on custom checkboxes

The following will, when selecting any extra options:

• change the product displayed price on single product pages
• change the cart item price on cart, mini cart and checkout pages,
• Display the selected options on cart items.

The complete code (based on your product custom setting fields):

add_action('woocommerce_before_add_to_cart_button', 'single_product_checkboxes_options');
function single_product_checkboxes_options(){
    global $product;

    $active_price = wc_get_price_to_display( $product );
    $html = '';
    
    if( $extra_field1 = $product->get_meta('_extra_field1') ) {
        $extra_price1 = wc_get_price_to_display( $product, array(
            'price' =>  $extra_field1 ) );

        $html .= '<p class="form-row form-row-wide" id="extra1_option_field" data-priority="">
        <span class="woocommerce-input-wrapper"><label class="checkbox"> ' . __("Extra Field 1", "Woocommerce") .
        '&nbsp;<input type="checkbox" class="input-checkbox " name="extra1_option" id="extra1_option" value="1"> + ' . wc_price($extra_price1) .
        '</label></span></p>';
    }

    if( $extra_field2 = $product->get_meta('_extra_field2') ) {
        $extra_price2 = wc_get_price_to_display( $product, array(
            'price' =>  $extra_field2 ) );
    
        $html .= '<p class="form-row form-row-wide" id="extra2_option_field" data-priority="">
        <span class="woocommerce-input-wrapper"><label class="checkbox"> ' . __("Extra field 2", "Woocommerce") .
        '&nbsp;<input type="checkbox" class="input-checkbox " name="extra2_option" id="extra2_option" value="1"> + ' . wc_price($extra_price2) .
        '</label></span></p>';
    }

    if ( $extra_field1 || $extra_field2 ) {
        $html .= '<div class="calculated-prices" style="display:none;">';
        $html .= $extra_field1 ? '<div class="sum_price_op1">'.wc_price($active_price + $extra_price1).'</div>' : '';
        $html .= $extra_field2 ? '<div class="sum_price_op2">'.wc_price($active_price + $extra_price2).'</div>' : '';
        $html .= $extra_field1 && $extra_field2 ? '<div class="sum_price_op_both">' .
            wc_price($active_price + $extra_price1 + $extra_price2) . '</div>' : '';
        $html .= '</div>';

        echo '<div class="custom-fields">' . $html . '</div>';
    }
}

add_action('woocommerce_after_add_to_cart_form', 'single_product_checkboxes_options_js');
function single_product_checkboxes_options_js(){
    ?>
    <script>
    jQuery(function($) {
        const initialPrice = $('p.price').html();
        var cbChecked1 = cbChecked2 = false;

        $('form.cart').on('change', 'input#extra1_option, input#extra2_option', function(){
            if ( $(this).attr('name') === 'extra1_option' ) {
                cbChecked1 =  $(this).prop('checked');
            } else {
                cbChecked2 = $(this).prop('checked');
            }

            if ( cbChecked1 && !cbChecked2 ) {
                $('p.price').html($('div.sum_price_op1').html());
            } else if ( !cbChecked1 && cbChecked2 ) {
                $('p.price').html($('div.sum_price_op2').html());
            } else if ( cbChecked1 && cbChecked2 ) {
                $('p.price').html($('div.sum_price_op_both').html());
            } else {
                $('p.price').html(initialPrice);
            }
        });
    });
    </script>
    <?php
}

// Save custom fields as custom cart item data
add_filter('woocommerce_add_cart_item_data', 'add_custom_cart_item_data', 20, 2 );
function add_custom_cart_item_data( $cart_item_data, $product_id ) {
    $product = wc_get_product($product_id);

    if ( isset($_POST['extra1_option']) ) {
        $cart_item_data['extra_options']['1'] = $product->get_meta('_extra_field1');
    }
    if ( isset($_POST['extra2_option']) ) {
        $cart_item_data['extra_options']['2'] = $product->get_meta('_extra_field2');
    } 
    return $cart_item_data;
}

// Display custom fields in Cart and Checkout
add_filter( 'woocommerce_get_item_data', 'display_custom_cart_item_data', 20, 2 );
function display_custom_cart_item_data( $cart_data, $cart_item ) {
    if( ! isset($cart_item['extra_options']) ) 
        return $cart_data;

    foreach ( $cart_item['extra_options'] as $key => $raw_price ) {
        $cart_data[] = array(
            'key'   => __('Extra option').' '.$key,
            'value' => wc_price( wc_get_price_to_display( $cart_item['data'], array( 'price' => $raw_price ) ) ),
        );
    }
    return $cart_data;
}

// Cart and mini cart displayed calculated price
add_filter( 'woocommerce_cart_item_price', 'display_cart_item_price_html', 20, 2 );
function display_cart_item_price_html( $price_html, $cart_item ) {
    if( ! isset($cart_item['extra_options']) ) 
        return $price_html;

    $product = wc_get_product($cart_item['variation_id'] > 0 ? : $cart_item['product_id']);

    if ( WC()->cart->display_prices_including_tax() ) {
        $price = wc_get_price_including_tax($product);
    } else {
        $price = wc_get_price_excluding_tax($product);
    }

    foreach ( $cart_item['extra_options'] as $key => $raw_price ) {
        if ( WC()->cart->display_prices_including_tax() ) {
            $price += wc_get_price_including_tax( $cart_item['data'], array( 'price' => $raw_price ) );
        } else {
            $price += wc_get_price_excluding_tax( $cart_item['data'], array( 'price' => $raw_price ) );
        }
    }
    return wc_price( $price );
}

// Change and set cart item custom calculated price
add_action('woocommerce_before_calculate_totals', 'set_custom_cart_item_price');
function set_custom_cart_item_price( $cart ) {
    if ( is_admin() && !defined('DOING_AJAX') )
        return;

    foreach ( $cart->get_cart() as $item ) {
        if( isset($item['extra_options']) ) {
            $price = $item['data']->get_price();

            foreach ( $item['extra_options'] as $key => $raw_price ) {
                $price += $raw_price;
            }
            $item['data']->set_price($price);
        }
    }
}

Code goes in functions.php file of your child theme (or in a plugin). Tested and works.