I have hosted one of my react app on Google Firebase which is by default HTTPS and one of my react app is hosted on AWS amplify which is also by default HTTTPS and the backend is hosted on aws-ec2 which is HTTP.
Is there any way that without upgrading my aws-ec2 to HTTPS I can use the service?
You can't use no http resource with firebase hosting, also you can't convert firebase hosting site to http. So, i suggest you to find another way to fix this.