Is it ok to spray silicone spray on the rubber drive shaft cover?

Is it ok to spray silicone spray on the rubber drive shaft cover?

To prevent it crakking, spray once a year with slicone spray.

Are there some risk?  Do I have to watch out that I don't spray other parts next to it?

I would make sure that none of that gets on the brake rotor or brake caliper

You'd normally use silicone on your weather strips in the winter to prevent them from freezing shut. You are not going to prevent the ageing of rubber significantly.

If you were to use anything I'd silicon grease, not a spray as a spray would contain solvents. But you will just attract dirt. For no reason. Toyota driveshaft bellows / gaiters are very long lived and will very often outlast the life of the car.

I use Gummipflege Rubber Protection by Nextzett on the rubber of my cars