OK, that makes a lot more sense. For the record, that really was not clear in your OP. But anyway, for sure you are right that you should be able to take some biomedical engineering electives in a chemical engineering major where you focus on biomolecular aspects of that field. It is kind of like biochemistry and chemistry (nonengineering). Some schools have biochem as a separate department, but most have it as a subfield within chemistry, so even those specializing in biochem get a diploma that shows a degree in chemistry. I suppose biomolecular engineering could have been called biochemical engineering, and the two subtracks would have had a kind of symmetry that way.
To get to your main question, I think your chances are decent at those schools you desire, but not at all certain. You need some others that offer what you want while at the same time offering you greater chances of admission. You could look at Tulane, they in fact have a very good biomedical engineering and chemical engineering departments, but I am not current on what they offer for biomolecular. I will check into it. It is hard to make suggestions though when we know nothing about your other preferences in terms of size of school, location, financial restrictions, etc.
I would also add that for the area of study you seem to be proposing, it is likely that graduate work is in your future. For that reason it is less important to attend a top top rated school now, but instead do that in grad school. I am not in any way saying don’t go for the JHU/CMU/Cornell type schools, but just saying that if they don’t work out for you it isn’t the end of the world in the least. There is excellent work going on in many schools just a small step below those in reputation, and those schools have very good track records at sending their graduates to the top engineering graduate programs.