[LTT]

You can add a string in Highlight(1):
[-
▲ Enable “Highlight Right Side” (or “Highlight Right All”) for it.
▲ Choose a color for it.

Or add this:
^\[-
▲ Enable “Regular Expression” for it.
▲ Enable “Highlight Right Side” (or “Highlight Right All”) for it.
▲ Choose a color for it.