Make please Lightbox work for galleries inserted in the Classic Editor, not only in Gutenberg

[v-o-v-a-n]

from:
"Open gallery in lightbox" not works for galleries maded in Classic editor

Somehow, at your leisure, please make the lightbox work for galleries inserted in the classic editor, and not just for galleries inserted in Gutenberg.
There, just change the classes in the links and connect css and js. I have connected both Fancybox and Lightbox for other cms and in general it is not difficult.

If I insert a gallery using the Gutenberg block, then the lightbox works in it.
This is good!
But if I insert a gallery in the classic editor, then there is no lightbox.

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At the moment I need to use an additional lightbox plugin for the entire site like https://wordpress.org/plugins/gallery-lightbox-slider/
and in the WP admin menu find the settings “Advanced Gutenberg”
/wp-admin/admin.php?page=advgb_main
Adv. Gutenberg -> Configuration -> Default blocks config
uncheck “Open gallery images as a lightbox style popup”.
so that the lightbox for the entire site is the same.