Has any info been leaked about how much money Xbox pays companies to have their titles on game pass?

I have trouble figuring out what keywords to search online.

In the past I recall Microsoft paid $10 million for a one year exclusive to GTA 4 DLC, and in that court case it was revealed Epic paid $1.3 million for the Batman games for the free week.

I can only imagine MS pays From Software Monthly, and I can also surmise MS knows how many digital downloads sell so they have leverage in negotiating a price with From Software.

Unless no one cares enough about thos to dig, or the info is public on their shareholder financial statements and I’m too dumb to find it.

I believe all we know is that everything is open to negotiation, so some companies will take an up-front fee, some get paid per player, and some take a combination of the two. But I suspect the actual amounts involved are so vastly different as to completely useless for analysis.