Creating sub/nested fields

[jacks0n]

Is it possible to specify sub-fields when creating Nodes?

I noticed I can set moderation_state[state] with just moderation_state.

I'm trying to populate an address and some Paragraph fields. E.g. field_address[0][address][country_code].

[jhedstrom]

Indeed! In the case of address, check out this example. However, that is functioning due to an AddressHandler in the Drupal Driver, so working with paragraphs may take some experimentation...