I don’t think it will hurt or help to merely list one’s heritage language . The ethnicity is not going to be hidden either way. My child is a somewhat fluent heritage speaker of an Indian language (not Hindi) . He did not list it in his college resume. I think if he had more indepth experience with it , such as reading, writing and literature exposure, it may have been worth mentioning. Or if it was part of a significant EC, such as helping to design curriculum at a heritage language school, one should definitely mention it. In my son’s case , neither of those were applicable.
Some universities do offer Hindi courses. In that case, the student can mention something about taking those classes in a “why us” essay. My child is a fluent Spanish speaker, and has mentioned an interest in that in his essays. Not sure if it will do anything, but it is a passion for him.