I want to pre-set the OP list on the BDS1.11 server software. I can use offline mode or not (I have my own verification system). However, no matter if I turn on offline mode, the players in ops.json are not loaded, it will only load the players in permissions.json.
However, permissions.json can't directly fill in the player's name, and when the player doesn't enter the server, I can't get their xuid, so I can't pre-set the op list.
Please provide a solution that tells me how to pre-set the OP list (using the name) or tell me how to get the player's XUID (before the player does not enter the server), such as providing an API to get the player's XUID. .

This will help me a lot!
Thank you!