I tried to find a similar issue raised but I was unable to find one. 

It would be nice to have a way to list all the required plugins that a JenkinsFile requires. In a simple implementation I would think that a key in the groovy script could be added which allows the writer to state which plugins a JenkinsFile uses and possibly a minimum version as well. 

More advanced way to handle this could be to add  a way to analyze a JenkinsFile and determine if there are plugins not in the list to make it easy to copy and paste the list into the JenkinsFile in case the writer uses a plugin without knowing it.