Where there is a large area of grass with multiple sports pitches marked out on it (for example, for use by a school), should the whole thing be tagged as leisure=pitch, or just the individual pitches. if If so, how should the rest be tagged?

Where there is a large area of grass with multiple sports pitches marked out on it (for example, for use by a school), should the whole thing be tagged as leisure=pitch, or just the individual pitches. if so, how should the rest be tagged?