Datapack

In order to use your EpicFight combat configurations on NPCs, you need to make a proper datapack

Common configurations

Regular EpicFight configurations should be placed in the npc_epicfight_mobpatch folder

EpicFight-Indestructible configurations

EpicFight-Indestructible configurations should be placed in the adv_npc_epicfight_mobpatch folder

Uploading

The datapack is now ready, and you just need to put it into the datapacks folder in your world folder

Example datapack

Here is an example datapack you can use on 1.20.1 (EpicFight-20.8.x) or 1.19.2:
CNPC_EpicFight_Datapack-1.20.1-20.8.x.zip
Here is an example datapack you can use on 1.20.1 (EpicFight-20.7.x) or 1.18.2:
CNPC_EpicFight_Datapack-1.20.1.zip
Here is an example datapack for 1.16.5:
CNPC_EpicFight_Datapack-1.16.5.zip

Selecting the configuration

Now you need to open the Model settings screen, and press the Select config button to open the EpicFight configuration selection menu
And select the configuration you want

Result

And now your NPC is using the configuration you want

Congratulations!