Hehehehe
No offense but I’m kinda happy they dont allow that. Its horrible entropy a better approach for manual entry is using a randomly generated passphrase (6+ words should be enough with a special character as a seperator if needed) or again using the autofill of a password manager, there are many available for mobile devices. I recommend checking out bitwarden for anyone new to password managers
Reminds me of someone on youtube doing a similar thing let me find it
Edit: Found it
Probably the lack of site isolation on mobile afaik