Autocomplete all array items in a compound index

[2color]

Problem

Given the following model in the Prisma schema:

model SavedArticle {
  id       String  @id
  content  Json
  feed     Feed?   @relation(fields: [feedId], references: [id])
  feedId   String?
  author   User?   @relation(fields: [authorId], references: [id])
  authorId String?
  url String

  @@index([a])
}

The autocompletion of the compound index should be available when the user types every array item.

It works on the first:

But not on the second.

Suggested solution

Suggest model fields for the second and following items of an index array.

Alternatives

Additional context