Firestore: how to perform a query with inequality / not equals

Question

I want select from Firestore collection just articles written NOT by me.
Is it really so hard?

Every article has field "owner_uid".

Answer 1

let query = docRef.where('role','>',user_role).where('role','<',user_role).get()

This is not functioning as the "not equal" operation in firestore with string values