Note: place creation is a large burden on iNaturalist, please see the warnings at https://www.inaturalist.org/places/new
Here is one way to get a boundary definition from OpenStreetMap to iNaturalist using QGIS and QuickOSM:
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download and install QGIS
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in QGIS, go to Plugins->Manage and Install Plugins
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search for and install QuickMapServices (this will let you see OSM in QGIS)
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search for and install QuickOSM (this will let you download OSM data)
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turn on OSM with Web->QuickMapServices->OSM->OSM Standard
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zoom to your area of interest, in this example I’m adding Gertrude Street Park
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you will need a key/value that will return your shape – this can sometimes be a little tricky to figure out in QGIS, so one option is to view OSM on the web and use the Query features tool
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after clicking on the park, I follow the link for Gertrude Street Park and make a note of the tags listed on the left
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back in QGIS bring up the search with Vector->QuickOSM->QuickOSM
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now I can use either leisure=park or name=Gertrude Street Park as my key/value, then specify Canvas Extent as the search area, and run the query
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right-click the new layer in the layer manager, then Export->Save Features As, then save as KML
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go to https://www.inaturalist.org/places/new and upload your KML file
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be patient, the place may not be fully incorporated into iNat for a few hours
