YouTube monthly video views by location is only available for artists that have a profile on https://charts.youtube.com. This is separate to a YouTube.com channel.
Only artists that have charted on YouTube Charts often will have a profile. More details on their criteria on the criteria can be found in this article on Google's help center: https://support.google.com/youtube/answer/9014376?hl=en).
Once an artist has a profile on charts.youtube.com you can add this to the artist page or reach out to our team for assistance with adding it.
Please note that Chartmetric cannot assist with claiming one of these profiles and you would need to work with your record label or distributor to request one.