Today I failed to install the texlive-full package because the latexml package was not found.
Installing the the snap latexml package did not resolve the error. When I tried to install perl-latexml the same error is showing up.
Any help to install a working and extendable pdflatex and latextohtml tool?
Thanks in advance!
What’s the exact message when you install the AUR package?
https://aur.archlinux.org/packages/perl-latexml
pamac build perl-latexml
Welcome to the forum! 
It appears you may not be up to date, please see Pacman-mirrors - Manjaro. Update your AUR packages after you have confirmed your repo packages are fully up to date.
FYI, TeX Live packages have been reorganized recently detailed in a recent Stable Updates post.
pdflatex is part of texlive-bin:
❯ pacman -F pdflatex
extra/texlive-bin 2023.66984-15
usr/bin/pdflatex
It does not appear perl-latexml has ever been in the repos as it’s been in the AUR (Arch User Repository) since 2015.