Extra fields - possbile to import/upload a file (blob) instead of linking to it?

Was trying to create of file field and it looks like you can only link to a file within nextcloud and not import/upload a file. Passman on the otherhand does this. Linking a file does NOT secure the file within the password database it’s only a link. Further if the file is removed the field is broken.

Any way to actually import a blob/file into the password database itself like in passman?

No, Passwords only does password management and has no file management capabilities at all.