Paragraphs migration example?

++ on #25 thank you Santhosh and cmeh.

As an alternative to Paragraphs, in case a more basic solution might work, migrating nested multivalue data into Custom Field → is easy. A structure like this:

"hyperlink":
  [
    {
      "linkurl_source": "https://drupal.org",
      "linktext_source": "Drupal"
    },
    {
      "linkurl_source": "https://gitlab.com/",
      "linktext_source": "GitLab"
    }
  ]

... can be mapped with this:

fields:
    -
      name: hyperlink
      selector: hyperlink
[...]
process:
  field_hyperlink:
    plugin: sub_process
    source: hyperlink
    process:
      linkurl: linkurl_source
      linktext: linktext_source

From Migrate multivalue fields into unlimited Custom Fields field → .