Hi,
I'm a beginner and I don't know if this the best/easyest way, but it works: create 2 text object and hide one.
I made it like this:
Create 2 text object using 2 different font styles and place them in the same position (as center or how you want)
Create other text for value (but you can use the first text value too) and hide this text clicking on eye near the object name.
Create a simple visual logic

Copy the text content from Text 1 to Text 2 in order to have the same text content.
Using the Value of the Text 3 and compare it - in my test compare if the value us greater than 50.
If the condition is true, the out boolean value is 1 and it trigger the visibility of the fist text (using the one font style).
If the condition is false, the boolean value is 0, the first text it will not be visible but the second condition Equal To will be true (condition equal to 0) and the visibility of the second text will be turned on and the second font style will be visible. (In the first case when the boolean value is 1, is not equal with 0 and the decond text is not visible)
Have FUN!
#XPression