HRA amenity charges to GF

Para 3 in Part III of Schedule 4 to the Local Government and Housing Act 1989 sets out the requirement to make a charge to the GF to properly reflect the community’s share of the HRA''s facilities and amenities, and LAAP 22 suggests that this would include open spaces, community centres, and playgrounds.

Does anyone include any other amenities or facilities in their charge?

And does anyone have a formula or framework for calculating the GF proportion that they''d be willing to share?