For funds to support implementation activities in cities, towns, regional school districts or educational collaboratives to expand pre-kindergarten or preschool opportunities on a voluntary basis to children who will be eligible for kindergarten by September 2021, utilizing the Massachusetts Preschool Expansion Grant public-private partnership model; provided further, that preference shall be given to districts serving high percentages of high-needs students; and provided, that additional preference shall be given to districts that have completed strategic planning efforts that support expanding access to high-quality preschool