Attempting to access NBT data from another mod

I'm trying to use MCreator to bridge a mod that includes RPG elements to another mod's weapons. The short version is that Mod A increases weapon damage for its weapons using weapon damage + strength, but for some reason this only works on weapons from that mod and vanilla weapons. I want Mod B to also benefit from this bonus damage from strength.

I know how to add the damage, I've done it before with another project of mine, but I am struggling to access that value in the player NBT data. From what I can tell, everything in MCreator operates under the Forge Data list, but the NBT tag I need to access is in the Forge Caps list. Is there any way I can access this data, including using custom code?