Thanks for showing interest.
To know how bundles work on itch.io, we have a guide: Co-op Bundle Quick Guide - itch.io.
The bundle will be assembled by itch.io themselves through: Hosting a co-op bundle - itch.io.
We also have a must-read guide: Things to keep in mind in a co-op bundle! - itch.io
The Bundle Revenue Splits is very visible on the page before approval (Read more about approval):
Your game will really be a great contribution to the project.
Thanks BE.