Just wanted to circle back and update this thread that the SharpTools.io platform integration is now released. You can find more details here:
Note that this supports the web dashboard and Rule Engine which are part of the web platform. If there's interest, we would need to rework the SharpTools Android App to use the SharpTools.io platform so it can take advantage of the expanding list of platform integrations.
In the mean-time, there are other workarounds. For example, if you still have a SmartThings hub (or at least an account!), you could use the SharpTools Android integration with SmartThings and then relay those events into Hubitat - either using the SharpTools.io Rule Engine or one of the ST-Hubitat integrations.