The tokens <prize>, <prizes>, and <rankings> all provide ways to do this. However, the <prize> and <prizes> tokens both display the prize name (there's no option to turn it off), so to have it say:
Winner!: Joe $500
2nd Place: Fred $200
you would have to set the 1st place prize to have the name "Winner!" and the 2nd place prize to have the name "2nd Place". Note the colon (
between the prize name and the rest is not configurable.