Is it possible to use AWS Amplify DataStore without GraphQL? I tried looking at the documentation and it has operations like save, query, etc only in GraphQL.
Not currently but GraphQL is just the implementation medium as it gives advantages around the transport as well as type inference for performing conflict resolution and sync. Without it you would need a proprietary way at the network layer to convey the same information. Is there a reason or use case you're looking to not use GraphQL?