General architecture for event based listview items

Dear Community,
I need your swarm knowledge! 🤓

I am a newbie here on flutterFlow and apologize for my lack of knowledge 🙈

The short plan:
An external library (flutter_nsd: ^1.5.0 from pub.dev) can fire 2 different events:
1) An specific listview item should be added (device found)
2) An existing/specific listview item shoud be removed/edited (device removed)

The listview is on a tabpage inside of an tab control which is basicly in my main activity.

My questions:
1) How and where can/should i listen to these events to be able to add/remove listview items ?
2) Since I need the event data for later use, i save it in a list (of custom structure).
Every listview item should get access to these structure (e.g. for display some properties).
How can i realize that?

Thanks in advance for your answers😇
Cheers!🍻