You need to become very familiar with lines H2A(n) and H2A(o) of the common data sets for schools of interest. The first one tells you how many awards they gave out that year to people that had no financial need. The second tells you the average award.
For example, Duke gave 14 awards to students with no need in 19-20. The average award was $76k. There was 943 students that had no need (H2(a)-H2(b)). So, 1.4% of the students in your “pool” get merit at Duke.