eshtreeli app

I have an application built in javascript language on Reat Native, I need to add to the project a feature that makes the app to run in the background for some activities in it,(background task maneger from expo didnt work on most of the devices) On the other hand, I have a web page with JavaScript that contains a Google map. I need to see the change in the map marker, which moves according to the data given by Database, which is the coordinates of the location of several people.