Why not enable all sprig template functions in logql label/line formatter?

Hi All, I have a quick question, why not enable all sprig template functions in logql label/line formatter?

From loki/fmt.go at main · grafana/loki · GitHub, we only support few sprig template functions, it is lack of date, data structure, etc. template functions. Not sure wether we can support more sprig template functions in logql label/line formatter?

Any thoughts, please advise. Thanks!