There are lots of ways to get data from OSM. You can do a websearch for something like “OSM download boundaries” to get some ideas, but here’s one that works for me.
In QGIS, install the plugin QuickOSM.
Run a Quick query in QuickOSM with Key = boundary, Value = administrative, and in = Maroondah.
To split the features into separate layers, do Vector->Data Management Tools->Split Vector Layer. Use either full_id or osm_id as the Unique ID field. Keep a note of where the layers save.
Bring the saved layers back into QGIS and for each one you want to use, right-click and choose Export->Save features as…
You can then use the saved kml files for your iNat place boundaries.
