How to migrate text format

Question

I'm figuring out how migrating works. When trying to migrate one of my nodes from a Drupal 7 site to Drupal 8 site I can't figure out how to set the Text Format of a field. I found this solution below, when looking for an answer, but this doesn't work.

field_name:
      plugin: get
      source: field_name
      process:
        value: value
        format:
          plugin: default_value
          default_value: "basic_html"

I also tried something like

field_name:
          plugin: get
          source: field_name
field_name/format:
          plugin: default_value
          default_value: "basic_html"

Or

field_name/value:
          plugin: get
          source: field_name
field_name/format:
          plugin: default_value
          default_value: "basic_html"

But non of these work. What am I doing wrong?

Answer 1

Have you tried removing the quotes?

field_reference:
-
  plugin: sub_process
  source: field_reference
  process:
    value: value
    format:
      plugin: default_value
      default_value: basic_html

Answer 2

Although it is more elegant to use a sub_process as @dibs proposed, you can also use a get process plugin

field_name/value:
  - plugin: get
    source: field_name/0/value
field_name/format:
  - plugin: default_value
    default_value: basic_html