I agree. I did a search on "jam" in this forum (which is also how I came up with your post) and so far none of the requests for this feature got an "official" reply. It is frankly a bit exhausting to have to click through the jams with titles that interest me and look for a mention of the games being rated on audio and graphics or a rule that lists the allowed game engines to figure out if a game jam is for TTRPGs or digital games.