Back around 1.8, I found a YouTube video tutorial for an enderchest xp storage command block line and used it for a while. This pack is a recreation of that, but updated to 1.16 syntax and condensed into a datapack.

How to use:

• Stand on an enderchest to store experience points.
• Stand under an enderchest to regain stored experience points.
• Pressing your bound button to view the player list will show your stored experience next to your username.

Multiplayer compatibility:

• Tested by having two players on top of a chest at the same time, under a chest at the same time, and on top and underneath a chest at the same time.
• Testing has only been done by two players due to lack of participants, if any bugs arise please feel free to contact me and I will work to fix any right away.

This was a fun project and I hope people can get a use out of it. c: