Can Assignment Status be used as Filter in Alerts Composer in custom Learning Resource Alerts?

Summary:

We are looking to develop further custom learning resource alerts in Alerts Composer to target users with specific HR Assignment Statuses eg we would like to exclude users currently on a Leave of Absence (LOA) status. Does anyone know if this is possible?

There are several options available to use as Expressions in the Filters section of an alert when using the Resource learnerLearningRecords/assignedToPersonDetails such as legalEmployerName, departmentName, jobname, and locationName. Assignment Category doesn't appear here so I expect it's not possible, but wanted to check if anyone had different information, or knows if a custom filter can be configured.