I cant find info as to generate charts for Bugzilla issues in Mediawiki, do we have any extension or way to achieve this?
Topic on Project:Support desk
No, and this is probably the wrong way to go.
First, find a package external to MediaWiki capable of doing that, then include it in MediaWiki by embedding it inside an iframe or something like this with the help of Extension:Widgets
See Extension:Bugzilla (but not sure if that functionality is already included)