Create contact modul without .md modify

I am in the process of making a new theme.
In this I would like to create a form. So far I have not been able to figure out how to create this form to work without the .md files generating the evolving form. Is it possible to get the form to run without an intrusion into the .md files? I just want to make it easy for the user to create only a Modular Page (Contact) and that works. Of course in cooperation with the e-mail plugin.

do you understand my problem?

Thx for answer