Dynamic Group Applies to scripting

You can't, it's specifically blocked to prevent loops. What are you trying to implement? There might be some tricks like the system.staticgroups mentioned below.

https://www.logicmonitor.com/support/devices/device-groups/device-groups-overview

Quote

Note: To avoid circular references, the criteria that determines which devices are auto-assigned to a dynamic group (i.e. the AppliesTo script) can only evaluate properties of the host itself, not any inherited properties from those groups of which it is a member. For similar reasons, the systems.group property is also excluded from use in a dynamic group’s AppliesTo script as the query itself could change the results of the query, potentially creating an endless loop. If you wish to create a dynamic group that is dependent on group membership, use the property system.staticgroups in your AppliesTo script: join(system.staticgroups,",") =~ "production".