Stat Panel | leading "+" on relative percentage

I am having a Stat Panels that shows the relative percentages of a value:

For example:

The value is 3% higher than another one
The vlaue is 3% less than another one

I visualise the value with the Unit Percentage.

What i try to achieve:
If the value is negative, all is fine, as the leading “-” is beeing displayed (- 3%).
BUT: if the value is positive, i want a leading “+” on the chart: (+ 3%)

What is happening?
But Grafana only shows the value itself, without the leading “+” and i didn’t find a way to add this to the chart.

Does anyone know how to add a leading “+” in this type of szenario?

A huge thank you in advance!

Grafana Version: 8.3.2