I believe this is a cool integration that I could not find in the forum.
It can be achieved using Node-red (https://flows.nodered.org/node/node-red-contrib-telegrambot). I believe it’s not difficult, since Telegrambot do the most of the job. There is an example in the above link how to capture latitude and longitude shared by telegram.
But how to inject latitude and longitude to an existing device_tracker? Installed node-red, but it is too new for me to accomplish this task. Any help is appreciated.
It would have the benefit to be possible to track a phone without having to give internet access of HA. Also Telegram shares location only for the time needed by the user.