Should make a place to remove it easily. Advanced users can do it with code, but I haven't found a site that lets me modify json_metadata for fields that aren't native to the site. I can do it, but a regular user won't be able to.
Also some UIs are using posting_json_metadata instead of json_metadata (because it requires a lower level posting key than active key), so you need to think about that.
Also, your witness shows up as disabled. LMK when its reenabled and I'll gladly vote for someone who's brought along a great onboarding solution to hive.