Visual Studio Code – Automatically adding a decorator to each Python function in VSCode?

While trying to add the @typechecked property above all (of the 487) functions, I was experiencing some difficulties with finding the right replace command. I intend to go from:

    def some_function(

to:

    @typechecked
    def some_function(

However, when I do Ctrl+H and replace def with:

@typechecked
def 

The indentation of the def gets lost.

Hence I would like to ask:
How can I add the property typechecked above all functions in all .py` files in vscode?