Apparently desktop Chrome has a flag called
--ignore-certificate-errors that allows you to bypass all certificate warnings. Is there an equivalent for Android Chrome? I checked in
chrome://flags but nothing there.
If you have chrome connected to a remote chrome debugging session (see here: https://developers.google.com/web/tools/chrome-devtools/remote-debugging), you can inspect the tab on the remote side, click on the miniature displayed screen on the remote side and type "thisisunsafe" just like in normal chrome.