How to give priority to server hosted on same machine while routing traffic using Apache mod_proxy_balancer?

Question

I am planning to use Apache mod_proxy_balancer to load balance traffic between internal services.

An example topology looks something like the following.

  Service A (host 1) ___                               __ Service B (host 1)
  Service A (host 2) ___|____> mod_proxy_balancer >___|__ Service B (host 2)
  Service A (host 3) ___|                             |__ Service B (host 3)

Note that there are 3 hosts and all of the are hosting instances of Service A and Service B. I want the routing logic where Service B on the same host should be given priority while routing the requests coming from Service A.

For example, requests from Service A on host 1 should be routed to Service B on host 1 as far as it is available. If Service B on host 1 is not available then and only then the request should be routed to one of the other available instances.

Is there a way to achieve this use case using Apache mod_proxy_balancer? I have checked various scheduling algorithms mentioned on the official docs https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html. Can not see any of the algorithm specifically handling this use case. Not sure whether https://httpd.apache.org/docs/2.4/mod/mod_lbmethod_heartbeat.html can be useful here as heartbeat response from the same host should be relatively faster?