style optica help

I am trying to edit Optica style, so it can show et al when there are more than 4 authors.
I am following this link

https://forums.zotero.org/discussion/3879/stupid-new-user-multiple-author-style-question/#pgbottom

But Optica style doesn't seem to be similar to other editable styles.

(see https://github.com/citation-style-language/journals/commit/435e19ecb360d17d33f2fb133e4ec9bb95d2d39f)

Would anybody be able to help me to edit the style? kind regards, Gabriela
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