How can I access OpenStreetMap POI Key: Data like Key:traffic_sign in an APP

Hi Guys,

I have a question

How can I access Key: Data like Key:traffic_sign in an Android-APP(Kotlin)
I Mean, I am creating a small app, and i want to be able to Access Key_Data with corresponending GPS Coordinates.
Can someone Help me?
How can I get access to the OSM Database and extracting Data from the nodes?

I need to use the Overpass API from OSM Database Project.

But how do I gain Access over this API in Kotlin?