Rewrite host specific rules ingress - kubernetes-ingress

Question

I assume more than two domains to be used for my multi-tenant code, domain1.com, mydomain2.com each will have a unique identifier and an ID would be maintained for each
I want my common app myApp hosted at myappdomain.com to serve both domains using CNAME and the service container should get a request prefix in the path based on the domain like:
domain1.com/home should translate the myApp request like myApp/111/home where 111 is the id
domain2.com/home should translate the myApp request like myApp/222/home where 222 is the id
This is working when the request is formed like domain1.com/myApp/111/home with the config below, but I want to use a generic rewrite rule to mask domain1.com/home to myApp/111/home & domain2.com/home to myApp/222/home
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: myapp-custom-ingress
namespace: myapp-dev
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /myapp/$1
spec:
rules:
- host: myappdomain.com
http:
paths:
- path: /myapp/(.*)
pathType: ImplementationSpecific
backend:
serviceName: ui-myapp-proxy-mgmt-webapp
servicePort: 80
- host: domain1.com
http:
paths:
- path: /myapp/(.*)
pathType: ImplementationSpecific
backend:
serviceName: ui-myapp-proxy-mgmt-webapp
servicePort: 80
Note: currently myApp is deployed in html\myApp directory of apache in the service image