Combine multiple modes (htmlmixed and stex)

Hi Community! Hope you are doing fine. I’m working with Codemirror inside a React app, and I wanted to know if there’s a way to combine two modes: htmlmixed and stex. I managed to get both modes working separately, but there are some cases were I want to highlight html tags and latex code.
I saw an example that hoes something like this:

CodeMirror.defineMode('stex_html', function (config) {
        return CodeMirror.multiplexingMode(
          CodeMirror.getMode(config, 'text/html'), {
            mode: CodeMirror.getMode(config, 'text/stex')
          })
      })

But I can’t get it working.
Here’s an example of the code I want to parse:

<p>A \\( ???mA??? \text{-kg} \\) object A is connected with a massless string across a massless, frictionless pulley to a \\( ???mB??? \text{-kg} \\) object B. Object A rests on a nearly frictionless plane, which is tilted at an angle \\( \theta \\) of \\( ???thetadeg???^{\circ} \\) as shown.</p>

Thanks in advance for the help!

You may be able to set up a multiplexing mode with HTML as the base mode, switching to stex when it finds an escaped paren.

Thanks for the reply marijn! I managed to solve this. Here’s the fix:

CodeMirror.defineMode('html_in_stex', function (config) {
        return CodeMirror.multiplexingMode(
          CodeMirror.getMode(config, 'text/x-stex'),
          { open: '\\text{',
            close: '}',
            mode: CodeMirror.getMode(config, 'text/html'),
            delimStyle: 'delimit' }
        )
      })

      CodeMirror.defineMode('html_stex', function (config) {
        return CodeMirror.multiplexingMode(
          CodeMirror.getMode(config, 'text/html'),
          { open: '\\\\(',
            close: '\\\\)',
            mode: CodeMirror.getMode(config, 'html_in_stex'),
            delimStyle: 'delimit' },
          { open: '$$',
            close: '$$',
            mode: CodeMirror.getMode(config, 'html_in_stex'),
            delimStyle: 'delimit' }
        )
      })

This snippet consider stex inside html, and also html inside stex (if the user want to include some HTML entities inside a latex text)