Clinton doesn’t seem to be putting it front an center in her campaign (possibly because campaign experts who actually know what they are talking about say not too, and possibly they are correct, and that is very sad), but her website is full of policy suggestions. Many of them are going in the same direction as Sanders, but half as far with a lot more detail.
Oh, and actually passing any of that is extremely dependent on taking control of the house and senate from the republicans. Fail at that and none of that gets done, regardless of the president.
IMO the best way for Sanders to affect change is to help pull the house and senate and state governments left. Get all those younger voters voting in those primaries and generals.