I'm looking how to create input forms on a button click

Hey, take a look at this: https://easyform.bubbleapps.io/

I want to reverse engineer it without paying the $500 the license is being sold for.

I’m having difficulty creating a workflow that instantiates an input field when you click the ‘add single line / multiline / radio button’.

In essence, I want to click an icon and then have the corresponding input field added in my RG. How would I go about doing this? Any tips or tricks?