Arduino w/ BT possible trigger

Hi everyone, I saw a similar topic in this forums and wanted to make my own in case the other author was asking the wrong question. The previous forum topic is: "http://forum.arduino.cc/index.php?topic=598030.0". My question is very similar to this one, can a Arduino BT trigger something on an android phone which will cause it to open an app made by me?
"control smartphone with arduino - Programming Questions - Arduino Forum" from this last forum topic a gentlemen named PaulS states that the Arduino is a USB slave and the person needs a USB master.

More info:
I have an Arduino Nano which is connected to a HC-06 BT.
At the moment I have already connected the Arduino BT to my android moto z2 force and I'm able to turn on an LED.
I'm using MIT App Inventor 2 which I have apps which can give me location and temp.

Okay now for my initial thoughts: from the two topics above, I can understand this will/is very hard and need to figure out how to make it work a different way if the Arduino cannot do it.

I hope this topic isn't wasting anyone's time, sorry and thank you for all your help.

http://solderer.tv/control-an-android-device-from-arduino/
Also found this which the Arduino sends information to the Android which states on or off. I would need something similar to this but that an app can see this and get triggered.