Currently, we do not have this feature to include when a school hits a particular % of absent students. However, we recommend you try a workaround by running this report.
You should be able to run a report which provides current year enrollment statistics by navigating the Start page > choose System Reports > System tab, click Enrollment by Section then enter information in the field and click Submit. After the generation of the Enrollment by Section Report, you would be able to View the students for the number of absent days for the section during the reporting period.
We recommend reviewing the article on enrollment-reports to provide you more information on the same.
Please let us know if this helps.