Hi Sanjay,
You can include those diagrams in your report template in the same way you include the diagrams owned by use cases. For example, to show the diagrams owned by a package you'd do something like this:
$repeatPackages
$repeatDiagrams
$Picture
$Name
$Description
$endRepeatDiagrams
$endRepeatPackages
You can see an example of this in the Project Specification report template.