Can you test in Minecraft POCKET EDITION with commands whether a player enters / leaves the world?

In my Minecraft world, I would like to be able to use commands to recognize whether a player is entering the world so that I can then execute commands on him. It is important that I play in the POCKET EDITION and not in Bedrock or Java. Is that possible? If yes how?

In any case, you can find out who is currently in the world

I've already tried it out a bit, but it doesn't work. I can tell when someone is in the world for the first time, but to recognize rejoining I definitely need something that tells me whether a player is leaving or coming.

With commands that are in the game as far as I don't know. However, you can write a small plugin with a YouTube tutorial that does the whole thing. If this is too much effort for you, it won't work.

If it works, please correct me.

Could you please write me the link from the tutorial?

Pocket Edition = Bedrock Edition

all versions except Java have been combined to Bedrock so that crossplay between all platforms is possible

I'm sorry I don't have a link jz. However, to program a plugin you would have to have a PC installed with java, a developer environment and a server, then you can install the plugin on your mobile phone, which is very complicated.

That's standard for me. My hobby is programming! I have the things