In case anyone was also struggeling for hours with:
Converting the first one of the values from 0 - 1 to 0 - 100
I used this as BLL expression:
$values[0]*100
To convert the other values, I entered this as BLL expression (Unit):
'
%\nT: '
+$values[1]*100 + '
°C'
Notice the temperature now is multiplied by a 100