[mckinney]

Thank you!

Yes, Manifold already supports Java 15 multi-line strings (aka text blocks) like this:

    var myValue = """
    [>.js<]
      function foo() {
        return "hi";
      }  

      foo();
    """;

You can embed a resource fragment as either a declaration or a value. You use a string to embed a value fragment as with the JS example above. Note the [>.js<] header indicates the resource type for the string, similar to your annotation. As you surmised, an expression such as a string literal cannot be annotated.