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I haven't looked, but does the fork and frame have mounts for the disc caliper?
You might find an answer by looking at the pictures.
But if changing wheels is too costly for you, then it's game over. Unless there's an adapter I'm unaware of. You can remove the roller brake, but a disc rotor won't have a way to be mounted on the hub, so new wheel time.On that note, maybe someone should make an adapter. Possibly way too niche but that doesn't stop some people.
All the electric assist versions come with hydraulic rim or disc brakes. I'm just trying to figure out if it's worth doing the conversion myself?