Addon updates if users install it from external websites

Hi, good morning to all. I’m developing a WebExtension and I have serious doubts about whether it would be possible to have the following scenario: most of the users of my addon will install it from outside AMO (typical landings) but I would like my addon to be listed in AMO too to take advantage of the automatic updates system without the needed of use an addon update manifest. Is it possible?

Thank you for all, if you need some extra information please let me know! Regards!

Having an external update.json is not that complicated. I recently did it on my addon and it works fine. https://github.com/andreicristianpetcu/google_translate_this/blob/master/manifest.json#L50