It’s currently not supported, but you are welcome to implement it.
What you would need to do is:
Emit a signal from Maya to Pyblish QML, such as publish()
Listen for publish() from Pyblish QML
You can accomplish (1) here by adding another method, such as publish() and (2) here by handling the incoming event, e.g. "publish".
There are a number of other events you can use to guide you, such as show().
I also fixed that bug you were experiencing earlier today, so you can update to the latest version if you’d like, and implement the feature in that version.