How do I get a Checkbox value in a table by user input – Html

I just want to improve the workflow in my business.
So I tried to make a small App for my employees, where they can add ordered Tires to a Table.

i want them to click the Checkbox when the tires are delivered and when they are mounted.

So for now they can add ordered tires.
But the Checkboxes are always shown as on.

Here is my Code:

function fillTable() {
  var table = document.getElementById("Tabelle");
  var row = table.insertRow(0);
  var cell1 = row.insertCell(0);
  var cell2 = row.insertCell(1);
  var cell3 = row.insertCell(2);
  var cell4 = row.insertCell(3);
  var cell5 = row.insertCell(4);
  var cell6 = row.insertCell(5);
  var cell7 = row.insertCell(6);
  var cell8 = row.insertCell(7);
  var cell9 = row.insertCell(8);
    cell1.innerHTML = document.getElementById("name").value;
  cell2.innerHTML = document.getElementById("size").value;
  cell3.innerHTML = document.getElementById("Art").value;
  cell4.innerHTML = document.getElementById("hersteller").value;
  cell5.innerHTML = document.getElementById("lieferant").value;
  cell6.innerHTML = document.getElementById("termin").value;
  cell7.innerHTML = document.getElementById("radDa").value;
  cell8.innerHTML = document.getElementById("reifenDa").value;
  cell9.innerHTML= document.getElementById("montiert").value;

tbody id="Tabelle" contenteditable>
    
    
</tbody>

    </table>
    <form action="">
        <input type="text" id ="name" />
        <input type="text" id ="size" />
        <input type="text" id ="Art" />
        <input type="text" id ="hersteller" />
        <input type="text" id ="lieferant" />
        <input type="date" id ="termin" />
        <input type="checkbox" id ="radDa" />
        <input type="checkbox" id ="reifenDa" />
        <input type="checkbox" id ="montiert" />
        <input type="submit" onclick="return fillTable();" />
    </form>

</div>
</body>

i don’t know if the

 cell7.innerHTML = document.getElementById("radDa").value;
  cell8.innerHTML = document.getElementById("reifenDa").value;
  cell9.innerHTML= document.getElementById("montiert").value;

is correct. I tried to replace .innerHTML with .value but it won’t work