Datamined Items can not be obtained legitimately.
They were discovered in the game's code and can only be obtained by a game specific Save Editor.
The number next to the Source notes Loot Luck.
Loot Luck Formula
1.2L0.27 × 100
1.2L0.27 + 100
P = Dedicated Loot Pool Chance
L = Loot Luck
⚙️ Recipe for mentioned chances