I haven’t found a way to modify the custom content of parameters after searching for a long time, but you can add the remarks you need on the url, like this:
For enabling XML comments, we need to do the following steps:
1.In the Build tab of the project properties, check the box labeled XML documentation file. Let’s keep the auto-generated file path.
2.Suppress warning 1591, which will now give warnings about any method, class, or field that doesn’t have triple-slash comments.

In the ConfigureServices() method, configure Swagger to use the XML file that’s generated in the above step:
public void ConfigureServices(IServiceCollection services)
{
// Register the Swagger generator, defining 1 or more Swagger documents
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new OpenApiInfo
//......TODO
// Set the comments path for the Swagger JSON and UI.
var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
c.IncludeXmlComments(xmlPath);
});
Now, adding triple-slash comments to the action method enhances the Swagger UI by adding a description to the section header.
/// <summary>
/// This is test
/// </summary>
///
///
[Route("test")]
[HttpGet]
public string Test()
{
return "v1 test";
}
Result:
