Route53 record targeting other hosted zone

Question

Given two hosted zones:

1. mydomain.com

2. someapp. (Managed by ECS/Cloud Map)

and given a service registered under:

service1.someapp. (Managed by ECS/Cloud Map)

Can you define a record like:

1. service1.mydomain.com, or

2. service2.someapp.mydomain.com

targeting the service mapped by service1.someapp?