Topology DNS azure

Hi folk,

I have 3 data centers, 2 on-prem (city A, city B) and 1 in azure, I want that if a service is consulted from azure the DNS sends it to the azure data center, if it is consulted from city A it goes to City A and of course if it is queried from city B it goes to city B, so there is no problem because I am using topology, the question is, I want that if a request arrives from another city it is balanced between city A and city B , can't send to Azure.

is it possible to create an irule? or maybe create two default routes in topology 0.0.0.0 one for City A and one for City B? it could work?