Hotchocolate & firestore query

[pavliy]

Hello. I'm playing with cloud firestore. And do really enjoy graphQL experience brought by HotChocolate.
Firestore API does not support IQueryable. So what's the best way to add support of graphql filter => firestore query?
https://firebase.google.com/docs/reference/unity/class/firebase/firestore/query

p.s. I've been browsing this repo and documentation for some time. But guess that still don't see full picture of the scope to be implemented to add for example equals and not equals.