[REQ] typescript-fetch - add config option to generate single-level request objects

I have a Spring Boot + Kotlin backend with an API endpoint defined like:

data class FooRequest(
    val bar: String,
    val baz: String,
)
@PostMapping("/foo")
fun foo(@RequestBody request: FooRequest) {
   ...
}

generating the client for this with typescript-fetch produces:

// models/FooRequest.ts
export interface FooRequest {
    bar: string;
    baz: string;
}

// apis/FooApi.ts
export interface FooOperationRequest {
    fooRequest: FooRequest;
}

// myFile.ts
new FooApi().foo({
    fooRequest: {
        bar: ''.
        baz: ''
    }
})

Describe the solution you'd like

The argument to the foo function should just be the FooRequest object rather than an object with the key fooRequest. Calling the API should look like

// myFile.ts
new FooApi().foo({
    bar: ''.
    baz: ''
})

This is how the generation is done in typescript-axios

Describe alternatives you've considered

Will probably use typescript-axios for this reason

Additional context

Start by tracing how the typescript-fetch generator creates FooOperationRequest and compare its output with typescript-axios. Done means a configuration option generates direct FooRequest arguments for the shown endpoint while preserving the current wrapped form when the option is not enabled.