How to send emoji via push notification?

Question

JavaScript

https://unicode.org/emoji/charts/full-emoji-list.html
I'm trying to understand why only some emojis come through push notifications
https://github.com/OneSignal/emoji-picker
So far only these ones come: ❤️ ☹️ ♧ ♢
i.e. it would be great to get some valuable resource that would help to understand what's going on

Answer 1

https://emojipedia.org/unicode-1.1/ - apparently only early versions of emoji work on push notifications