timespan property for api request in c# example

 I have defined a model where starttime and endtime are timespan fields. In swagger, by default it takes input in ticks as you see in below code but i want data to be taken in "hh:mm:ss" format.

 {
      "availableToCallExternalId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
      "startTime": {
        "ticks": 0
      },
      "endTime": {
        "ticks": 0
      },
      "availableDays": "string"
    }

How can we fix this issue?

Solution is we need to tell swagger that for timespan datatype we need "hh:mm:ss" format data and we can provide sample data 

public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton(Configuration);
            services.AddControllers()
                .AddFluentValidation(mvcConfig => mvcConfig.RegisterValidatorsFromAssemblyContaining<Startup>())
                .AddNewtonsoftJson(options =>
                {
                    options.SerializerSettings.Converters.Add(new StringEnumConverter());
                });

            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc(SwaggerConstants.Version, new OpenApiInfo
                {
                    Title = SwaggerConstants.Title,
                    Version = SwaggerConstants.Version,
                });

                c.AddSecurityDefinition("bearerAuth", new OpenApiSecurityScheme
                {
                    Name = "Authorization",
                    Type = SecuritySchemeType.Http,
                    Scheme = "bearer",
                    BearerFormat = "JWT",
                    In = ParameterLocation.Header,
                    Description = "JWT Authorization header using the Bearer scheme.",
                });

                c.MapType<TimeSpan>(() => new OpenApiSchema
                {
                    Type = "string",
                    Example = new OpenApiString("00:00:00"),
                });