Macro to add text to the front of a label

Hello,

I would like to create a macro that does the following:

label
up arrow (jumps to the front of the text)
LTC:
enter

This will allow me to append LTC to the front of my timecode cues. However, when learning this macro, the up arrow is not recorded.

Does this mean that changing a label via macro is only possible by clearing the whole text? If so, that means I would lose the existing information in the label field

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