firestore security rules for nested documents

I have Two collections in firestore

1. userTbl
2. instituteTbl

In userTbl, I have store schoolid of specific user in schoolid field. Now, I want that loggedin user should able to get access of data of there schoolid only.

What I Tried

match /instituteTbl/{userTbl/userID/schoolid}/{document=**}{
      allow read, write: if true;
    }

But Its not working, Please help me with this

Screenshot of userTbl Data structure Screenshot of instituteTbl Data structure []