community.general/docs/docsite/helper/lists_mergeby/default-recursive-true.yml

list1:
  - name: myname01
    param01:
      x: default_value
      y: default_value
      list:
        - default_value
  - name: myname02
    param01: [1, 1, 2, 3]

list2:
  - name: myname01
    param01:
      y: patch_value
      z: patch_value
      list:
        - patch_value
  - name: myname02
    param01: [3, 4, 4, {key: value}]