This is the Forge version. A Fabric version is also available.
This mod adds a datapacks folder inside the .minecraft/config directory, so you can install data packs that apply to all saves / new saves. You'll no longer need to create a save before adding the data pack. It's especially useful alongside mods that use data packs for their primary config, such as Level Up HP or I Am Very Smart, and for mod packs that want to distribute data packs by default.