When you run your game with this mod installed, not only will it create a config file for you to define what items you want dropped by the Gacha Machines, but it will also generate a csv file in the same location containing a list of all inventory items, their ids, and their description.

This list can be viewed with any text editor, but will look best in a spread sheet, such as Excel or Google Sheets.
Use it to find the inventory ID numbers of the items you want available in the loot so you can use them in the config file.

Each time you run your game, the list will be regenerated, to account for any new or removed custom items.
If you have custom items in your item list, adding or removing a mod that contains custom items may change the item IDs, and you may have to update your config file.

The list of items in the config file is a simple comma separated list of item IDs.  Each item in the list has an equal chance of being chosen, meaning you can put the same item in the list multiple times for an increased chance to obtain that item.

WARNING:  Giving yourself items that are normally unobtainable, or normally need to be obtained through progression can possibly break your save.  Do not, for example, use this to give yourself deeds, or unimplemented items.  And, as always, please backup your saves before using.

Inspired by Rowyfo (Row).