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@renevanbelzen I can't remember from the top of my head, and unfortunately is too far away from a machine running Raspberry Pi OS right now. But on the Ubuntu machine, I have at hand, I can press Ctrl + . to show the emoji picker. Or right-click and choose Insert Emoji.
But it can very well be that Raspberry Pi OS lacks this support. So maybe something like Splatmoji could be worth checking out?
You could also look into installing additional fonts to get better support for emojis.