Result abstraction cannot be mapped correctly using NSwagStudio when generating typeScript client proxy

Question

I'm using this Result abstraction to send an appropriate message with my data. For example, I'm using the following code to return the JWT together with a welcome message:

  public async Task<Result<TokenResponse>> GetTokenAsync(TokenRequest request)
  {
    ...
    return await Result<TokenResponse>.SuccessAsync(response, "Welcome Message");
  }

I'm using the following endpoint to send the token to client:

[HttpPost("token")]
public async Task<ActionResult<TokenResponse>> GetTokenAsync(TokenRequest tokenRequest)
{
    var token = await _identityService.GetTokenAsync(tokenRequest);
    if (token.HasError)
        return NotFound(token);
    return Ok(token);
}

It is working correctly but when I want to generate the typeScript client proxy using NSwagStudio the generated TypeScript file doesn't contain the Result type so, I cannot have the message in client. It is generated as below:

getToken(tokenRequest: TokenRequest): Observable<TokenResponse> {
    let url_ = this.baseUrl + "/api/identity/token";
    url_ = url_.replace(/[?&]$/, "");

    const content_ = JSON.stringify(tokenRequest);

    let options_ : any = {
        body: content_,
        observe: "response",
        responseType: "blob",
        headers: new HttpHeaders({
            "Content-Type": "application/json",
            "Accept": "application/json"
        })
    };

    return this.http.request("post", url_, options_).pipe(_observableMergeMap((response_ : any) => {
        return this.processGetToken(response_);
    })).pipe(_observableCatch((response_: any) => {
        if (response_ instanceof HttpResponseBase) {
            try {
                return this.processGetToken(response_ as any);
            } catch (e) {
                return _observableThrow(e) as any as Observable<TokenResponse>;
            }
        } else
            return _observableThrow(response_) as any as Observable<TokenResponse>;
    }));
}

You can see that there is nothing about Result class in the above code. Have I forgotten something? Any suggestion?