wp network meta

# Get a list of super-admins
$ wp network meta get 1 site_admins
array (
  0 => 'supervisor',
)

Name	Description
wp network meta add	Add a meta field.
wp network meta delete	Delete a meta field.
wp network meta get	Get meta field value.
wp network meta list	List all metadata associated with an object.
wp network meta patch	Update a nested value for a meta field.
wp network meta pluck	Get a nested value from a meta field.
wp network meta update	Update a meta field.