vyos@r14# run show conf com | match haproxy
set load-balancing haproxy backend bk01 server 192.0.2.5 address '192.0.2.5'
set load-balancing haproxy backend bk01 server 192.0.2.5 port '993'
set load-balancing haproxy service wan-993 listen-address 192.0.2.2
set load-balancing haproxy service wan-993 port '993'
[edit]
vyos@r14# 
[edit]
vyos@r14# set  load-balancing haproxy service wan-993 listen-address 192.168.122.14
[edit]
vyos@r14# commit
[ load-balancing haproxy ]
{'backend': {'bk01': {'balance': 'round-robin',
                      'mode': 'http',
                      'server': {'192.0.2.5': {'address': '192.0.2.5',
                                               'port': '993'}}}},
 'global_parameters': {'ssl_bind_ciphers': ['ecdhe-ecdsa-aes128-gcm-sha256',
                                            'ecdhe-rsa-aes128-gcm-sha256',
                                            'ecdhe-ecdsa-aes256-gcm-sha384',
                                            'ecdhe-rsa-aes256-gcm-sha384',
                                            'ecdhe-ecdsa-chacha20-poly1305',
                                            'ecdhe-rsa-chacha20-poly1305',
                                            'dhe-rsa-aes128-gcm-sha256',
                                            'dhe-rsa-aes256-gcm-sha384'],
                       'tls_version_min': '1.3'},
 'pki': {},
 'service': {'wan-993': {'listen_address': {'192.0.2.2': {},
                                            '192.168.122.14': {}},
                         'mode': 'http',
                         'port': '993'}},
 'timeout': {'check': '5', 'client': '50', 'connect': '10', 'server': '50'}}