---
- name: Merge recursive by 'name', prepend lists
  set_fact:
    list3: "{{ [list1, list2]|
               community.general.lists_mergeby('name',
                                               recursive=true,
                                               list_merge='prepend') }}"
  vars:
    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}]
- debug:
    var: list3