This is EXACTLY what I am trying to accomplish right now. I'm trying to figure out how to be able to either get a link to the store, how to get the data for the plugin into an approval task for the process owners, and then allow them to schedule the install. I've been working with my rep's at ServiceNow and they let me know that the API to get the information from the store such as the release notes and changes is locked down. 

I'm now trying to, instead, give Process Owners access to the Application Manager with read only access. Then when an update is available, an approval task is generated to their team with a link to that plugin in the Application Manager so they can review and approve or reject. The trigger to generate this approval is that the available version is higher than the installed version for the plugin. 

Finding a place to consistently show all the plugins in a table with their versions  and names so we can build the trigger is proving difficult.