Popup modal form after inputting email address & popup will have the Email field prefilled with the email address that was added?

Hello everyone hope you are doing well.

It’s an emergency, so any type of help would be highly appreciated.
So my client wants an email field, which after filling up a popup form will appear where the email address should be prefilled with the mail address that was inputted first. Something similar to this,

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Where user will input mail address & a popup form will appear prefilled with the mail address.

Any kind to help or helpful article will work too,
thanks again :slight_smile: