I’m not sure if the oh-label card itself provides this functionality.
But try the config/style/background section from the widget here within your card
The code for the widget I demoed during my tour of the UI for the Virtual Meetup in December 2020. It provides a card for displaying temperature, humidity, luminosity measurements along with the battery status for a plant sensor. This widget can then be made the default standalone widget for the parent Group item (Equipment) representing the sensor.
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Prerequisites
It will assume your items to have this naming scheme:
{props.item}_Temperature
{props.item}_Moisture
{props.item}_Light
{…