Video #59
This video shows you how to:
Add Public Health England Covid data from 'Living Atlas' datasets from ArcGIS OnLine - [note you have to be logged in to AGOL]
Display the Covid-19 data as a simple thematic
Add labels
Customise the labels using Arcade scripting
Export the label script
This is a good video to get you started not just with the Living Atlas but also with Arcade script. Arcade is an option to javascript, vbscript and python. Arcade is ESRI's scripting language for expressions/formula - it isn't a full programming language. So its not for use to build a client application.