Consume API with parameter on POST

Question

Using the code below I try to consume an API but I don't how to pass the parameter to post or save the model.

 

What code should I write?

var product = new List<ProductModel>();
var client = new RestClient($"https://localhost:77321/Product/Create");
var request = new RestRequest(Method.POST);
IRestResponse response = await client.ExecuteAsync(request);