Emote forwarding from Bedrock clients is possible using a custom extension: KosmX/geyser-emote-extension.

Limitations

BE uses encryption as content copy-protection, copying bedrock emotes to java is impossible.
Also, bedrock can not accept custom emotes at runtime, we have to work with the existing ones.
https://github.com/JustTalDevelops/bedrock-emotes

Emotes must be manually linked, to do this (or use a template), please follow this link:
https://github.com/KosmX/emotes-geyser

more details:
#60 (comment)