When my daughter verbally committed back in June 2022, they told my daughter and wife a percentage, who called me to confirm and I said heck yah. The head coach followed up with a text to my daughter verifying what they had talked about.
Forward to November 2022, my daughter got an email with her NLI offer, signed by the head coach and the AD. Page 2 was Athletics Grant in Aid Agreement that included a matrix that has rows titled Full, Partial, Other, plus columns that had Tuition & Fees, R&B, NRT, USHIP, Orientation Fee, Books, and Total. This was then filled out.
Every school has a different format. When you are discussing and an offer has been made, make sure you clarify what is and isn't included so no surprises later.
Good luck.