Is it possible to spawn in a static item other than scrap inside crates?

There is the option in LootTables to add a certain amound of scrap being in each crate.

Only for example if you want every crate to contain a M92 pistol, simply adding "pistol.m92": 1 on the bottom section doesnt work, it seems like the plugin doesnt recognize it.
Also if you replace the "Scrap": 100 for a other item, it simple after reloading adds the Scrap section back in the Json file and the item you want dont pop up in crates.

Is this possible without editing the plugin file to recognize a other item? or does the plugin need to be modified to accept the other item you want to spawn in each crate, just like "Scrap"

Thanks in advance!