Just putting this suggestion here for the ability to indicate what symbol / value to add to the end of truncated text instead of just the ellipsis (...)
Technically there is support for this in code via the text-overflow CSS property, so it might be good to also bring that functionality within Figma Design.
Additionally, hoping it could also be possible to change the way text is truncated, where we wouldn't be limited to just text lines, and have the ability to switch to set the truncation via number of characters in the text layer.