Is there a documentation that show how to display report charts on mobile?
Since it's a feature flag, I don't think there's much documentation for it. There is a little note about it here, though it's not particularly useful.
wait, what?
We do do charts on mobile?
This is fantastic!
Are you displaying properties or calculating something behind this chart?
Mobile Graphing does exist, but it's quite complex and is intended to be configured based on reports built for the purpose by Dimagi staff. It is available as a services offering with Dimagi's support.