OData support is now available starting from FINT 5.0!  This support is different other test clients (like Postman) in that FINT generates  a strongly-typed client that it uses for the testing.  This means the underlying HTTP is abstracted away and you would not need to worry about it,  You also will not need to learn the "OData Query Syntax" because FINT comes with a built-in editor that you can use.

Here's the full list of features :  Full List of Features for OData Testing - Test GRPC Services with FINT (bytesmotion.com)