Obviously I’m a ways away from that being of any concern 
but I remember staff gathering feedback for it quite a while ago, and I seem to remember that the N1 explanations were done quite a while ago.
Not pressuring the staff about it, just curious about where it’s at or if it’s being worked on.
Do you mean a grammar deck?
I’m not sure about a deck but some non JLPT grammar has already been released. Its at the very bottom of the grammar library.
In the 2025 year round up they mentioned fleshing out more of the JLPT grammar points.
In case you can’t find it from CLっE’s description, Non-JLPT is at the bottom of this page.