Step 1:

• Open your minecraft profile
• go to config/axiom/hotbars
• if your want to restore a already set up Hotbar figure out which save that would be e.g creation time
• if you dont want to restore a hotbar delete all saves

Step 2:

• join the server
• set up the hotbar system as you wish
• leave the server (do not join again as this would generate a second hotbar save)

Step 3:

• run the script
• select both target file and target folder (should be the same but if you have a save in the 1.21.1 profile you can copy that over too)
• Press the Generate 256 files button
• You know should have the same hotbar each time you join

Step 4:

• to update changes made to the current hotbar
• press the replace with most recent button each time u leave the server

Script is based on ChatGPT