How to get space from LVM volume

I get Space and mountPoint as null
{ id: 'sda2',
  node: '/dev/sda2',
  whole: false,
  parent: 'sda',
  name: 'sda2',
  description: 'Linux LVM',
  blockSize: 512,
  blocks: 499066880,
  readOnly: false,
  mounted: false,
  mountPoint: null,
  partitionType: null,
  fs: 'LVM2_member',
  space: { total: null, available: null, used: null },
  removable: false }