Hi, I want to create a component that will be single-selected radio buttons along with a fixed amount and the last radio option will be adding a custom amount so that the user can set the amount of his choice. Moreover, The amount that the user selects or writes will be stored in a variable to display later.

Here is what I want:

I have a single-selection radio group component working but need help with a custom field to enter the amount.

Can anyone point out how to do this?