Nginx and HTTP2 Push feature is coming in 1.13.9 and explained here
https://www.nginx.com/blog/nginx-1-13-9-http2-server-push/

Some further interesting Nginx Webcast

NGINX: Access Management and Security Controls – EMEA
https://www.nginx.com/resources/webinars/nginx-access-management-security-controls-emea/
MRA AMA Part 8: Secure Inter-Service Communication
https://www.nginx.com/watch-on-demand/?id=microservices-secure-inter-service-communication