@philborremans You have to use either of these three JSON files given (as per your requirements).
Follow below steps to add JSON to list view:
- Go to your list and open the newly created list view.
- Open the view dropdown and choose Format current view:
- Click on the Advanced mode:
- Remove the existing JSON from textbox. Then copy JSON from GitHub, paste it in textbox and click Save.
For more information, follow this documentation: Use view formatting to customize SharePoint
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