Update appModel from page App

Hello everybody, my question is simple ! Is there a way to update the appModel from a page of my app plugin ?
The problem is that I can’t access appEditCtrl from my page app.
Thanks for your help !

you can only do this from the app config component

Thanks Torkel ! And so, is it possible to store data differently in App plugin, using grafana api for example ?

not sure what you mean by differently?

Actually, all I need is to be able to store and read some json from a page app, no matter the way.