Sorry, but those currently can't be added to LinkedIn. I think we have an enhancement issue, and I'll add your request there. Also, you can search for it at https://codeschool.uservoice.com/forums/217988-feature-suggestions and vote for it there.
If many users want this I think that'd bump up the priority of the feature.
For now, note you can make your Report Card public so others can see your achievements!