Hi, I’d be keen to join the working group too. I made a related post back in February Current state of web and mobile monitoring and teleoperation
Since then, I have used my very minimal web development experience, to create a (not yet published) node package with a set of React components for working with ROS. The repo for this is here.
My plan was to improve it a little bit, publish it to NPM, then make a post here, hoping that others would be able to add improvements. It suits my current needs (video feed, gamepad support, touchscreen gamepad) but is pretty clunky.
I haven’t got loads of time to work on it, but if I can use this to contribute somehow I would be keen!