Customizable highlighting for generic text

[epiqu1n]

Is it possible to add a textmate scope for general text that appears in a tagged string? For example, in this:

I would like to customize *, id, test, etc. However, there is no scope (except general JavaScript) for text that is not something in particular like a keyword or a quoted string, so any general kind of text cannot be highlighted. This is similar for HTML strings, where I may want to make plain text in an element a different color: