How to integrate eureka with istio 1.1

Application case

In our future prod case, one part of services(apps) may run in istio service mesh , the other part of services may run with spring cloud (eureka、zipkin. etc) for historical reasons, how can we integrate eureka with istio for unified service discovery ?

Istio version

Istio 1.1.0-rc.2 above

Other

I found some issues #469 about this aspect , and the issue was closed , but docs can’t be found in istio1.1.0 website.