Significance of the "hash" field reported by the 'bitcoin-cli getblock' command

Significance of the "hash" field reported by the 'bitcoin-cli getblock' command

It is stated that the header of a block does not contain a 'hash' field ( see https://en.bitcoin.it/wiki/Block_hashing_algorithm or Antonopolous' Mastering Bitcoin 2nd Ed. ) This makes sense since inlcuding such a field would be self-referential.

However, when interrogating the blockchain for info on a specific block for example via 'bitcoin-cli getblock' a 'hash' field is reported:

{
  "hash":  "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048",
  "confirmations": 534047,
  "strippedsize": 215,
         .
         .
         .

Is the "hash" field something that the 'bitcoin-cli' calculates and inserts in situ into the json for informational purpouses

OR

is it that the "hash" field >is< actually part of the header and my understanding of this aspect is flawed?

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