Given the lower speed and load the bearings will be subject to in a mount you should be fine running them dry.
Ceramic bushing lubrication.
Grease and oil lubricants can also be added to full ceramic bearings as well as hybrids in order to change performance characteristics such as increase speed reduce ball skidding or reduce noise.
Prevent electrical arcing when electrical current passes across bearings a washboard pattern appears on the raceways along with a darkened grey appearance.
Ceramic cermet bearings are used successfully in many oil water and process lubricated pump applications.
There are ptfe grease formulations for full ceramic bearings but they are used more in higher speed applications such as cycling.
Typical results include bearing surface damage premature aging of the lubricant.
Grease and oil are common lubricants for hybrid bearings but ceramic bearings are less sensitive to fluctuations in lubrication conditions.
The natural insulating properties of ceramic material eliminates this type of damage.
Lubrication all bearings whether steel or ceramic require lubrication.