RDS and F5 session collections

MY RDS configuratin

 

We have F5 with Server 2016 RDS configured. So I have my 2CB's, 8 RSH's and 4 collections in my RDS environment(gateway and webacess is ion the CB's). Without using F5, I can connect to the CB and launch the remote app from the collection and it access only the RSH assigned to the collection, once we add F5 it sends the client to any of the RSH hosts in the environment. How can we have F5 understand that their are session collections in place and requests for the remote app should only be directed to the RSH in the collection?