Not really, i wanted this to just be a personal password manager and sharing passwords is mostly out of scope in that respect. Although there's nothing stopping you having multiple 'passbox.gpg' files of different names with different keys by manipulating the PASSBOX_LOCATION env variable within aliases or something like that.
You can still decrypt the file with just GPG if you wanted and modify the file in plain text. Passbox just acts as a layer on top of that to interrogate the encrypted GPG file.