I still consider the templating language I shared before, even at the time of this comment, to be good.
But, as recognized earlier, others may find it doesn't hold up to today's standards. "Good" is not only not a constant, but is also subjective. Do I really have to explain the entire universe here? Man.
You didn't share a templating language, though? You shared an example of a formatting/templating string, but didn't even indicate what level of format string it supported. Such that I don't know if you are sharing C's printf, bash's printf, PHP's... I can presume you don't intend to include CL's FORMAT. Even if I do have a softspot for it, myself.