Add protocol citation type?

Would it be possible to add a new subtype for a citation for when you’re citing a protocol (eg a published protocol on So when making a new reference you could select protocol (and/or if importing a bib file from there, it would be recognised as a protocol citation).

It is always possible for any user to generate a new reference type and create a template in your output style to accommodate a special need. but I am not sure about the flexibility of importing it as a protocol ref type. I am not as familiar with editing import filters or connection files.