How to make typwriting text that align center not start at center

I learn to make typewriting dialogue from this video Unreal Engine - Easy Typewriter Text Tutorial - YouTube
everything work great except that I want the text to align center
but when use type writing effect that render characters/sec
the first few texts will show up at center and then moving around as it has more character
that make it hard to read and annoying player
I see some game use this method, but the text starting point is start
like it’s already calculate the longest of line not just 1-3 character
anyone know how to do it?

sorry for my poor english