Zigbee2mqtt: show the networkmap in home assistant

Thanks for the pointer Kris,
I could see from the z2m log in the hassio\add-ons\zigbee2mqtt console that Z2M was loading a file configuration.yaml from the /share/zigbee2mqtt folder but couldn’t see this folder in my WinSCP view which made me wonder if this was a relative path. Not so, once I restarted the FTP add-on with protected mode off and reconnected with WinSCP I could see this folder and the configuration.yaml file. I then proceeded to make the edits as suggested in documention link you sent.
configuration.yaml:

devices: devices.yaml
homeassistant: true
mqtt:
  base_topic: zigbee2mqtt
  password: xxxxxxxx
  server: mqtt://homeassistant
  user: MQTTuser
permit_join: false
serial:
  disable_led: true
  port: /dev/ttyACM0

and created devices.yaml:

'0x00158d000233767a':
  friendly_name: 'office_wireless_switch'
  retain: true
'0x00158d0002f2a338':
  friendly_name: 'office_motion_sensor'
  retain: true
'0x00158d00030a51ab':
  friendly_name: 'elec_blanket_pwr_plug'
  retain: true
'0x00158d00032d38fc':
  friendly_name: 'bed_lamps_plug'
  retain: true
'0x00158d000396ada9':
  friendly_name: 'wir_ceiling_light'
  retain: true
'0x00158d0003cf65de':
  friendly_name: 'office_ceiling_light'
  retain: true

After restarting Z2M and regenerating the network map the friendly names were displayed:

.