Can you auto fill password on Windows 11?

This is quite challenging since the text box for every app come with their own version (also a security risk)

That's not possible, AFAIK. But you can configure auto logon, if you're the only user on system:

https://learn.microsoft.com/en-us/troubleshoot/windows-server/user-profiles-and-logon/turn-on-automatic-logon?WT.mc_id=WD-MVP-5000693