How do I add a sensor to a date stamp?

How do I add sensor.office_outside_temp_2 to this automation?

Thanks,
Grey

service: mqtt.publish
data:
  qos: "1"
  retain: false
  topic: wledPixel-5AAE/zone0/text
  payload_template: >-
    {{ now().timestamp() | timestamp_custom('Welcome to the Grey Fox  %-I:%M:%p  %_A,  %_B %d, %Y ')  }} 
  payload_template: >
    Welcome to the Grey Fox {{ now().timestamp() | timestamp_custom('%-I:%M:%p  %_A,  %_B %d, %Y ')  }} The outside temperature is {{ states('sensor.office_outside_temp_2') }} °C

Thanks, that works great.
I was trying to put it inside what was there instead of adding something after.

Grey