Change the color or size of text in a conditional expression

[vincBUUS]

I want to do this : 

=If(vMesure = 'avg',Red('%') & ' ↔️ ∑','% ↔️ ' & Red('∑'))

But as you might guess, it doesn't work. Is there a way to change the color (or even the size) of an element of a sentence in an expression on QlikSense?
Are there extensions capable of doing this?

Thank you for your help

[Kushal_Chawda]

@vincBUUS  In which chart you want to change the colour of text?

[vincBUUS]

It's the label/title of a button

I want to change the color of the % and ∑ elements based on the value of a variable...

[Kushal_Chawda]

@vincBUUS  I don't think you can do that as it will apply colour to all elements and not individual. Probably need some extension

[Or · Accepted solution]

Seems like it'd be easier to create two images, one for each state, and swap between those based on a condition, than to try and work around text formatting limitations.