1.19.2 How do I make an item have two textures, one held, and one in the inventory

[signalscrossed]

Also, how do I double the size of the held item model? I've tried modifying the json file but it seems to be incompatible with data generation and I don't know how to get the data generator to ignore that one specific json file.

[MFMods]

> How do I make an item have two textures, one held, and one in the inventory

an example of that would be a trident.

> Also, how do I double the size of the held item model?

open the model in blockbench (or just make a new one). set scale and angles for left hand, right hand, item frame (fixed), etc.