const res = await Organization.findAndCountAll({
      attributes: [[
        Organization.sequelize.literal('array_agg("Establishments.id")'), 'ids',
      ]],
      include: [{
        model: Establishment,
      }],
    });

SELECT "Organization"."id", "Establishments"."id" AS "EstablishmentsIds", "Establishments"."id" AS "Establishments.id", "Establishments"."title" AS "Establishments.title", "Establishments"."imageUrl" AS "Establishments.imageUrl", "Establishments"."email" AS "Establishments.email", "Establishments"."phone" AS "Establishments.phone", "Establishments"."ssid" AS "Establishments.ssid", "Establishments"."createdAt" AS "Establishments.createdAt", "Establishments"."updatedAt" AS "Establishments.updatedAt", "Establishments"."organizationId" AS "Establishments.organizationId" FROM "Organizations" AS "Organization" LEFT OUTER JOIN "Establishments" AS "Establishments" ON "Organization"."id" = "Establishments"."organizationId"