I needed this today once more. This could go in the generic search, since currently there is a “Creator” category at the top, we could have a “Game jam” category.
There could also be a search field specifically for game jams on the Jams page (the one with the jam calendar).
To avoid searching for too many things in the generic search field, you could also play with prefixes with autocompletion. Ex: you start typing “ja”, it suggests prefix “jam:” then you can enter the jam name and it will search in the jam category.
Right now I know the jam exact name so it’s a bit weird that I cannot find it on the website unless I use a generic web search engine, or I find a submitted game and click on the jam link from there.