It will work with any HTTP request verb.

Most REST dev clients have support for HTML preview, just remember to set Content Type. I don't think swagger-ui can do that as it's not an app, rather a page running in a browser.

Set response type to HTML:

ClassMethod Test()
{
	set %response.ContentType = "application/html"
	do ##class(%CSP.Utils).DisplayAllObjects()
	quit $$$OK
}

In Postman click Preview button:

Can you elaborate please? What do you want to do?