Browser_mod to display alternate entity

I have been trying to use browser_mod to cause the history of a secondary entity to be displayed when the primary entity on the card is ‘clicked.’ The method, among several, using the browser_mod integration seems to work as advertised when setting this up in an entities card but fails when used inside the Simple Thermostat card. Code below is from the sensor entry of the Simple Thermostat card.

  - entity: sensor.ps_heat_time_hm
    name: Heat Time
      action: fire-dom-event
        service: browser_mod.more_info
          entity: sensor.ps_heating
      name: Heat Time
    unit: h:m