@ViTko
So then consider the following to group your data:
AddColumns(
GroupBy(
AddColumns(yourListName,
"_category", Category.Value
),
"_category", "_records"
),
"_projectCount", CountRows(_records)
)
The above will give you the categories grouped and the counts for the projects.
As for the nominees, tell me more about that column - I know it is a person column as you have mentioned, but is it multiple-select or single-person?