Nevermind, I was too blind to see that I was editing the wrong pieces

Sorry for the late reply.

Weapon cubes do work, you just need to ensure the values make sense.

Example:
"Total Weapon Cubes": "10000000",
"Timeline Weapon Cubes": "1000",
"Timeline Max Weapon Cubes": "100000"

"WeaponCubeBank": {
"totalWeaponCubes": "10000"
},

"weaponCubesCollectedOnArenas": [
1000
]