Currently, according to the public information below, there's a limitation for users to create rollup fields.

Title: Rollup column considerations

URL: https://learn.microsoft.com/en-us/power-apps/maker/data-platform/define-rollup-fields#rollup-column-considerations

Depending on customer's business operation, they would like to have more than 10 rollup fields in one table.

It would be much better for users if limitation could be off or the number of limitation could change regarding rollup fields.