Alternate login passcode - diff. From iOS device login

I am looking for having an alternate login pass code that is different than one’s iOS device access passcode/face-ID.

For example - device access passcode is 1234
I would like to set Brave access 9876 not 1234.

I see this as an additional level of security to access the brave platform if one would get into my phone/iPad. Etc.

Thanks