One thing you could try is to set up HomeBridge running on an always on system, like a Raspberry Pi or similar. It would be interesting to know if HomeBridge as the middleman properly supports the 'charging' status of these battery-backed-up smart outlets. There are two community developed HomeBridge Plug-Ins for Hubitat. One simply uses the Hubitat built-in Maker API app, while the other uses a custom Hubitat App.
These solutions are Open Source. If necessary, you'd have more flexibility in making changes yourself to try to get things working the way you desire.
Just an option to consider. 