Maybe a weird question, but is it possible to add additional layers / end-points to an existing hosted feature layer in ArcGIS Online? I know you can create a hosted feature with multiple layers / end-points in a single service/item, but once you upload it there doesn't seem to be a way to add additional layers. Perhaps using the REST API or ArcGIS API for Python?
Have found myself in a situation where this would be beneficial, rather than recreating or uploading an additional hosted feature layer.
As an example, this Living Atlas layer for Recent Hurricanes has three layers / end-points in one service.
https://services9.arcgis.com/RHVPKKiFTONKtxq3/ArcGIS/rest/services/Recent_Hurricanes_v1/FeatureServer
What if you wanted to add a fourth?