Nice one.
My notifications are a quick basic way. There are other blueprints that dig deeper into notifications. Must say I haven’t looked at it just because I dont need that blueprint but I know it is very active and the developer @SgtBatten supports it well so if that suits you better maybe try using it and ask the developer of that blueprint.
If you would like more complex way in your notifications I have seen @samuelthng blueprint. It creates a script with heaps of options you can have in a realy nice layed out way. Once you create a script with this blueprint you can use it in this blueprint in the custom action. In your action select call service / scripts: Turn on and select your script. That just may help you do what your looking for. Link to it is below.
Hope this helps you.
Blacky 