I understand the question was answered a year ago, but I do not really see any update on a release date. The question here is if the sharing will be in R80.20 or maybe even in R80.30? I do not really see any answer stating that anywhere (sorry I must have missed that).
Currently the real answer is: They cannot. be shared.
The only way to work around it is to use a special user for reporting. For special views, the only way is to export the view you created and issue that export to you colleagues for them to import.
Regards, Maarten