EDIT: actually you cannot install from the chrome web store anymore, but this post solves it providing all the needed commands to isntall the onscreen keyboard from sources:
hi @Wheaten , the above solution doesn’t seem to work anymore. When I get to the Web Chrome Store, all Virtual Keyboard extension require Chromium to be updated, and cannot be installed on the current shipping version of Chromium (whihc is 92.0.4515.98 in the last Raspberry Volumio OS).
Does anybody know how to get the extension installed on the shipping chromium version? I couldn’t really understand or find out (I’m a bit of a noob) how to update the shipping chromium itself.