You can expect rear tire wear to exceed front tire wear. Thats normal for any bicycle, analog or electric. My LBS once told me its a 3:1 ratio which sounds about right. All the weight is on the back.
For many years I rotated my tires, and this is commonly done. Wear out the rear tire, move the front one to the back, replace the front. Or literally rotate the rear forward after a few thousand miles so you get even wear. Many years into the game, I finally stopped doing that, as I decided it was pointless extra effort and I was just feeding an OCD impulse.
Tires are going to wear so just replace the one that is worn out. Let the front one last forever if you like, being mindful of the casing's integrity over time. Also tires are typically best performing at their max cold inflation rating on the sidewall. Don't overdo that. If you want a smoother ride, its better to address it in different ways, but if you can get away with it (and you might not) you can underinflate. Remember the psi/bar rating on the side of the tire is cold pressure so don't read it after riding or while the bike is sitting in the sun. Know that it will increase past the sidewall rating in normal use and thats fine.
