Grafana dashboard creation "Quick ranges" option change from code

I want to customize the “Quick ranges” options just below the right nav bar…I have my custom build from grafana github page. Now I want to edit the code for this part. Can you suggest is it possible? Because I am trying to find those code, but can’t find it till now. Any help is greatly appreciated.

look for file name range_util.ts or something similar (this from memory)