I guess you're right that many of these all control a kind of metadata. What I specifically wanted to do was change how link previews for the user appear. For individual games that's controlled under a widget that handles a bunch of metadata stuff (including a tab literally called "metadata") but there doesn't seem to be an equivalent for the user page.
A member registered Jan 25, 2020 · View creator page →
A Final Fantasy-themed ttrpg
An index of items and equipment described flavorfully.
A Cthulhu Dark mystery scenario
A one-page game about getting into a robot with your comrades.
An unfinished ancient personal project.
A list of most spells found in the literature of Lovecraft and his contemporaries.
Guide to the setting of Batman comics' Gotham City.
Tabletop rules for playing and running a Pokemon rpg.
Simple descriptions of the main eldritch horrors of the Cthulhu Mythos.
Rules for running a Bayonetta-themed tabletop rpg.
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This topic is one of the top results when googling "itch.io metadata" so I'd say it's at least worth consideration lol. Also, same goes for setting metadata for the profile page (which I actually still don't know how to do)