Android Template Widget with referenced HTML source

Hi there,
I’ve tried already a lot with the template widget for the android companion app - also with the HTML features. I am now looking for a possibility to let the widget show any external HTML reference. Ideally, I then have a .txt or .html file in my www folder and can reference it from the template and render the content in there. I tried to handle this the way you would do it on a webpage, but didn’t get any solution by doing so. Would be great to hear if any of you have made something similar already or just have an idea on how to do it!

You can only do basic html formatting

I read this on the documentation page as well, but I didn’t find that very meaningful. Is there any list of supported HTML functions or similar?

just for text styling