The graphics in the Telegram-bot

Hi! Dear friends, my issue addressed to the owners of both iOS and Android platforms. Therefore, a category I can not decide.

I recently did a review on one game in the Telegram. I was puzzled by the fact that in the Telegram-bot appeared graphics. Don't know how this solution is implemented in other similar games (that I have to find out). At the moment I'm doing a report on retro games and their revival in 2018 and I NEED MORE DATA.

Dear friends, I have a small request to you. What game engine Telegram-bot WITH GRAPHICS you know?

For example, I know that such a feature appeared in the Wasteland Wars. Somewhere else I have not yet seen. Maybe I was looking for a Fig.

I would appreciate any feedback. Thank you!