About Google Maps

Is there a way to display values on a map or on google maps

Your question is vague, so vague answer is yes.

Maps are either presented as vectors or rasters (pixels with color coded meanings). Raster maps are easy to work with and add values to if you know coordinates for values and coordinates of the map.

You can add information layers on google maps, but that has very little to do with processing.

I have some values from arduino. They represent GPS’ X Y Z Axis . How can I code Processing to display them in google maps

You can add manually things to google maps https://www.google.com/earth/outreach/learn/visualize-your-data-on-a-custom-map-using-google-my-maps/

https://www.codeinwp.com/blog/google-maps-javascript-api/ might works as springboard to create a web page with your data on a google map. You can use processing to create the web page with necessary javascript.

You can also add information layers to google maps https://developers.google.com/maps/documentation/javascript/layers