Continuous pinch zoom is supported by the browsers and I used to use it a lot on Windows. Is it not there on GNU/Linux? I couldn't find anything like that. There are some software like libinput, fasuma. But they don't do that what is available on Windows and Mac.
We can move it to “chit chat” if the question mark doesn’t mean it’s for help.
All too often posts are made by users in the wrong section so you can never be sure.
Without the text below, I would have moved it to the Issues & Assistance