Adding 2 other pools to one pool, without iRule

Hello,

I would like to create a pool that is containing 2 other pools P3=P1+P2. I don't want to add the members from P1 and P2 separately in P3 because that means that I have to maintain one more pool when changing members in P1 or P2. I would like for this to be done without iRules. As a second option can I add 2 pools to a VS? I want that LB::server pool to return both P1+P2 members

Is this possible from F5?

Thanks.