Enabling coordinates on your server is very easy. Though do note you will need to enable cheats to run commands from in-game.
You can follow this to enable cheats:
How To Enable
To enable the coordinates, you will need to enter the gamerule for this.
To do this from the console, you can do:
gamerule showcoordinates true
To do this from in-game, you can do:
/gamerule showcoordinates true
Updated on: 11 / 26 / 2020