Lubrication all bearings whether steel or ceramic require lubrication.
Ceramic bushing lubrication.
Given the lower speed and load the bearings will be subject to in a mount you should be fine running them dry.
For example compared to steel bearings ceramic balls can operate under the same lubrication conditions at speeds up to 20 higher.
Typical results include bearing surface damage premature aging of the lubricant.
The natural insulating properties of ceramic material eliminates this type of damage.
Grease and oil are common lubricants for hybrid bearings but ceramic bearings are less sensitive to fluctuations in lubrication conditions.
There are ptfe grease formulations for full ceramic bearings but they are used more in higher speed applications such as cycling.
Ceramic cermet bearings are used successfully in many oil water and process lubricated pump applications.
In applications lubricated by water or process fluid bearing materials need to be both chemically resistant to the fluid and able to operate with thin films.