You might be asked to write about it, yes, though I don't recall one that insisted on it at the moment. For example, the University of Nevada, Reno's Physics P

You might be asked to write about it, yes, though I don't recall one that insisted on it at the moment. For example, the University of Nevada, Reno's Physics PhD application gives the following as one of the writing prompts to consider to address admissions criteria: "Describe experiences and activities that demonstrate a commitment to diversity, equity, and inclusion."