How to set Input Field static start string thats unchangeable?

Unity Engine
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1

I want my input field to display a string value thats unchangeable, but text can be appended to it.
My use case:
userName: inputted text here

Bold is unchangeable and cannot be deleted
Italic is text entered by the user and can be changed/deleted at will.

I understand that I can separate the two and make the username a static TMPUGUI. This is not desired.

Please only answer if you know how to achieve the feature using only 1 TMP Input Field.

Thanks

2

I figured it out thanks