I extended Tex parser of u-ctags agressively.
universal-ctags/ctags#2424

Commands in \newcommand are captured.

universal-ctags/ctags@3e2c7ce

If you think u-ctags captures more things, please, consider to open an issue at u-ctags repo.
I wrote a very small interpreter to capture language objects appeared in latex macros.
So I hope u-ctags Tex parser can support your request quickly.

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