Syntax highlighting does not work for script tag with non-standard attribute

Hello everyone,

I have search several similar posts but did not find a solution for my problem. My script-tag inside an html file has two additional attributes and looks like this:

 <script cam-script type="text/form-script">
var cfg_frontend = camForm.variableManager.variable("cfg_frontend").value;
// [...]

Inside this script tag, syntax highlighting does not work. I have also tried the context action "inject language" -> "javascript" but this did not change anything. I would like IntelliJ to treat this script tags as if they were standard javascript tags. Is that possible with IntelliJ Ultimate?

Thanks and regards

  Dierk