Hello,
I have just purchased a Vivoactive 4 and needed a widget for displaying data from my personal weather station. A have made a very simple exemple widget based on the following:
https://github.com/abs0/GarminWebRequestTest
I have added some rows of code that extract the data from the JSON and display the values to the watch widget. I hope this can help someone that would like to do something similar.
The source code is available from:
https://github.com/LarsThunberg/GarminJSONWebRequestWidget
//Lars Thunberg