Hey Serge, Yes, if the Admin goes into Setup > Workspaces & Projects > Select the workspace in question > Fields > Type = Defect. Those are the fields for Defects. You can edit the fields using the Gear icon. Most fields allow you to flag them as Required. Please note that this will affect new defects going forward, it will not enforce the requirement for existing defects.
Please stay tuned to the Community for an announcement regarding Templates. I'm not sure on the release date but this functionality is coming soon.