How to specify a composite constraint/index with `nulls not distinct` and a function for a col?

unique()
  .on(sql`LOWER(label)`, table.owner, table.parentGroupId)
  .nullsNotDistinct(),

query error: zero-length delimited identifier at or near """"

ALTER TABLE "groups" ADD CONSTRAINT "groups_unique_idx" UNIQUE NULLS NOT DISTINCT("","owner","parentGroupId");

uniqueIndex('groups_unique_idx_index_no_nulls').on(
    sql`LOWER(label)`,
    table.owner,
    table.parentGroupId,
  ).nullsNotDistinct() // <-- this is not available

uniqueIndex('groups_unique_idx_working').using(
    'btree',
    sql`LOWER(label)`,
    table.owner,
    sql`"parentGroupId") NULLS NOT DISTINCT; --`,
  ),