Hello Konya Biyori! I was looking at your question, and I managed to create a function in the "Battle Functions" script where I updated the stats on global.party from the 'current stats' from the oBattle.partyUnits array.
After coding the function, I added a call to the function when oBattle is destroyed to ensure that the stats are kept for the next battle. Please let me know if you need more info to execute this.
Best,
Osvaldo (Kikilo)