Enlarge / Shrink styled Text from DesktopTextArea

I need to add a “global“ Enlarge (A) / Shrink (a) styled text displayed in TextArea.

I completely forget how to do it.

I get an eye on the documentation and it seems that is a complex task (for desktop):
copy the RTFData into a MemoryBlock
loop the MB and modify the Size value
once done, apply the new RTFData.

Is-it correct ?

PS: speed does not matter as the text is not large (1K-5k ?)

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