Convert light from three way to single pole

I have a series of lights in my basement on two three way switches. I would like to take one of the lights off the three way and have it on it's own new smart switch. I don't know how to rework the wiring for this. I don't know if this complicates things or not but at the junction box of the light I want to change is a transformer to the doorbell.

So, at the end of the day what I'm trying to accomplish is have one existing light on it's own new smart switch, with the remaining lights on existing three way switches. Any help is appreciated.