I hacked together a basic canvas drawing website that allows you to draw using the built-in beta web browser and live-share it to another computer. This is primarily useful for using your kobo as a whiteboard in a Teams/Zoom meeting.
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The source code for the server is on GitHub.
I'm also hosting an instance of it at kobo.kaiser.lol.
To use it on two devices, you need to use the exact same URL to be in the same room. When you visit the homepage, it'll redirect you to a 4 digit room with /r/<number> at the end of the URL. The easiest way is to visit the homepage on your kobo device, then enter the same URL onto your desktop computer.
There are a bunch of limitations currently, that anyone is more than welcome to help out with contributions on GitHub:

The source code for the server is on GitHub.
I'm also hosting an instance of it at kobo.kaiser.lol.
To use it on two devices, you need to use the exact same URL to be in the same room. When you visit the homepage, it'll redirect you to a 4 digit room with /r/<number> at the end of the URL. The easiest way is to visit the homepage on your kobo device, then enter the same URL onto your desktop computer.
There are a bunch of limitations currently, that anyone is more than welcome to help out with contributions on GitHub:
- Sometimes when drawing, the webpage will decide to zoom which messes things up. The best resolution in this case currently is to reload the page as state is stored.
- Using the rotate function on desktop is useful for viewing a landscape-created drawing on an Elipsa 2E, but drawing from the rotated computer is completely broken due to the CSS used to perform the rotation.
- Full screen mode has no way to bring back the toolbar, you just have to reload.