My daughter has a scholarship (based on active service at school - she started a club and campus task force in support of refugees. CU Boulder had the same.
I’m sure most campuses have ways for you to serve.
Some may reward you via admissions benefit (but some won’t care). Others may not reward you admissions wise but may reward you financially. Others may reward you in neither way but still reward you through the positive feelings you accrue through your hard work and the good you do for society.