Well having seen the replies. I suppose I am looking at adding a light (5 pounds or less?) motor to a nice road or gravel bike. Budget...as little as possible haha. Eventually I might spend up to a couple of thousand on a motor I suppose. I mean I'm looking for the low end of the range, just to get an idea of what there is.
And definitely usage is to add a power boost for hills or maybe sometimes for long distances, without adding too much to make the bike usable as a normal ride for exercise.

Thanks.