Is possible to allow adding attributes using data? I'm a modpack creator and having the possibility to add attributes to other mods weapons without the need to create a mod for that would be really helpful.

This is completely out of scope for this specific project. As this project is purely responsible for defining the baseline attributes for magic (with some enchantments and effects), and not responsible for actually doing things with it.

There are already general tools to assign attributes to any item.

• On 1.21.1, something like Default Components https://modrinth.com/mod/default-components
• On 1.20.1, CIA https://modrinth.com/mod/cia