There are multiple options in the repos:
$ pacman -Ss sass
...
community/dart-sass 1.49.8-1
Sass makes CSS fun again
...
community/libsass 3.6.5-2
C implementation of Sass CSS preprocessor (library).
...
community/ruby-jekyll-sass-converter 2.1.0-2
Sass converter for Jekyll
community/ruby-sass 3.7.4-3
Sass makes CSS fun again
community/ruby-sass-listen 4.0.0-9
Listens to file modifications and notifies you about the changes
community/ruby-sassc 2.4.0-2
Use libsass with Ruby!
community/sassc 3.6.2-3
C implementation of Sass CSS preprocessor.
...
Using homebrew
seems like the wrong approach given Arch/EnOS already has a package manager and the AUR, but the error in the log is this:
ERROR: One or more files did not pass the validity check!
which could point to this thread:
This seems like quite a specific web development question and kind of broad for the EnOS forum?