📝 Examples:

To use the datapack features you'll need to add a button to the datapack settings sub-menu if you want players to be able to use your menu from the pause menu.

Run command example

data modify storage datapack.menu add.button append value {label:"(Button Name)",width:120,action:{type:"minecraft:run_command",command:"(The command you wish to run)"}}

Show dialog example

data modify storage datapack.menu add.button append value {label:"(Button Name)",width:120,action:{type:"minecraft:show_dialog",dialog:"namespace:(dialog)"}}

Built-in Example (The one which comes pre-loaded)

data modify storage datapack.menu add.button append value {label:"Datapacks Menu Settings",width:150,action:{type:"minecraft:show_dialog",dialog:"datapack_menu:config"}}

📗 Guide:

When setting up this system into your datapack you only need to run a simple data modify command, this will allow the datapack to merge the button you add into the settings menu, I do plan on adding more features for other developers, but as of the moment this is the current system we have,
As for setting this system up, copy from the prior examples and add it to your setup function, then on reload this datapack will reload and update the storages!
With the Run Command: example I suggest having a trigger command so that non-oped players can run this, with this I'd suggest having it show a dialog based on the trigger e.g: My other datapack Inventory Pets has a command /trigger inventory_pets which shows a dialog and allows players to run sub-commands via the trigger commands, like controlling their sound/particle settings, open an in-game wiki and report issues via this sub-menu.
With the Show Dialog: Example if you have a simple dialog baked-in your datapack that just leads players to a bug-report/Guide/Uninstall function then this would be more preferable if you don't need players to run sub-command functions for non-oped players.

🐛 Bugs - Issues:

Currently this datapack has one major issue which is that if you open the main menu and try to enter the settings sub-menu you need to leave the escape menu and go from there, however with the nature of this pack and how it works I'm unsure of a way to fix it.
If you come across any bugs please report them in the issues.

⛳ Misc:

There is a smithed datapack with similar features however, to my knowledge it's hard coded and a more difficult setup, althought both are viable if you prefer that version,