How to use one loadbalancer for exposing two deployments in two different node pool?

I have two docker images that run on two different node pools. Api runs on say node-pool-a, Api-legacy runs on node-pool-b.

Now I wanted to access both via same loadbalancer using this snippet.

apiVersion: v1
kind: Service
metadata:
  name: api-service
spec:
  selector:
    app: api
  ports:
    - name: api
      port: 8000
      targetPort: 8000
    - name: api-legacy
      port: 1883
      targetPort: 1883
  type: LoadBalancer

But I notice I can use selector for one deployment. Help!