Future possibility to publish _AM_PROG_TAR for general use?

Dear experts,

I'm interested in whether publishing _AM_PROG_TAR in tar.m4 for general use is a considerable idea, or bad idea.
In my understanding, _AM_PROG_TAR is designed to help "make dist" of Automake target, and it is not for general use.
There are some source packages whose top-level makefile is not managed by autoconf/automake and write their own "make dist" recipes.
One example is FreeType. Currently it is hardcoding "tar --format=ustar -chf -", like:

https://gitlab.freedesktop.org/freetype/freetype/-/blob/master/builds/toplevel.mk?ref_type=heads

I hope its portability can be improved by something like _AM_PROG_TAR.
It is not so difficult to reimplenetation of _AM_PROG_TAR in each software project,
but if automake can consider publishising _AM_PROG_TAR, the maintenance would be easier.

Regards,
mpsuzuki