I think Dataverse's .tsv files, which are versioned on GitHub, have more of the things that are expected in the metadata profiles linked to in FAIRSharing, like what fields are required or optional and how many times a field can be repeated. So I've been wondering if we could add an entry to FAIRSharing that points to those .tsv files on GitHub, at least as a start.
But maybe this could be discussed during the Dataverse community meeting? It sounds like foundational changes to Dataverse's metadata handling will be discussed then.