how to set unicast mode about ansible-keepalived HOT 5 OPEN

unicast_src_ip: "{{ (groups['all'].index(inventory_hostname) == 0) | ternary(hostvars[groups['all'][0]].access_ip,hostvars[groups['all'][1]].access_ip) }}"
unicast_peers:
  - "{{ (groups['all'].index(inventory_hostname) == 0) | ternary(hostvars[groups['all'][1]].access_ip,hostvars[groups['all'][0]].access_ip) }}"

all:
  hosts:
    hap1:
      ansible_host: 10.0.2.31
      ip: 10.0.2.31
      access_ip: 10.0.2.31
      ansible_user: ansible
    hap2:
      ansible_host: 10.0.2.32
      ip: 10.0.2.32
      access_ip: 10.0.2.32
      ansible_user: ansible

vrrp_nic: enp0s3

keepalived_sync_groups:
  haproxy:
    instances:
      - internal

keepalived_instances:
  internal:
    interface: "{{ vrrp_nic }}"
    nopreempt: true
    state: "{{ (groups['all'].index(inventory_hostname) == 0) | ternary('MASTER','BACKUP') }}"
    virtual_router_id: 42
    priority: "{{ (groups['all']|length - groups['all'].index(inventory_hostname)) * 250 // (groups['all']|length) }}"
    vips:
      - "10.0.2.30/24 dev {{ vrrp_nic }}"
    unicast_src_ip: "{{ (groups['all'].index(inventory_hostname) == 0) | ternary(hostvars[groups['all'][0]].access_ip,hostvars[groups['all'][1]].access_ip) }}"
    unicast_peers:
      - "{{ (groups['all'].index(inventory_hostname) == 0) | ternary(hostvars[groups['all'][1]].access_ip,hostvars[groups['all'][0]].access_ip) }}"