Hi,
Below is a sample view of responses gathered from a Form;

It is the Excel sheet that is available in the 'Responses' tab within the Form.
I realise that you can edit, delete etc in a Forms response excel sheet. However, what I'd like to do is add an auto incremental ID, every time a new response is submitted, like so;

Adding the Column is easy of course, but I'm stuck on how to fill in the incrementall ID. I would prefer to use a Flow to do this if possible, rather than create an Excel function.
Thanks for any help