Purge or disable host in sync rule after change source file

Hi
i don’t understate how work purge in Icinga Director Sync Rules.

I use JSON file as source for import/sync
example typical file fragment

"CAM-037": {

        "model": "",

        "type": "",

        "display_name": "",

        "ip_address": "",

        "mac_address": "",

        "parent": "",

        "uplink_port": "",

        "enable_monitoring": true,

        "name": ""

    },

    "CAM-038": {

        "model": "",

        "type": "",

        "display_name": "",

        "ip_address": "",

        "mac_address": "",

        "parent": "",

        "uplink_port": "",

        "enable_monitoring": false,

        "name": ""

    }

if i wont delete host i delete it from source file, run import/sync, and its fine work
but, if i wont temporally disable host.
example
if “enable_monitoring”: true - host add to sync,
else “enable_monitoring”: false, - host sync and disable.

how i can do it?