JavaScript-inside-Ruby-highlighting

Dear Forums,

im using Netzke Framework for RoR/ExtJS RIA development. I'm missing syntax highlighting of JavaScript inside Ruby files.
The creator has provided a snipped for TextMate though:

When JS is in the following form
<<-JS
  // JavaScript code comes here
JS

It can be highlighted with:

{ name = "source.js"; begin = "<<-JS"; end = "JS"; patterns = ( { include = "source.js"; } ); },

Is this possible in RubyMine? Is RubyMine TextMate-compatible for bundles?

Thanks,
Paul