Commons has some files that haven't been used on any Wikisource yet: sample file
It would interesting if one could add there a pagination string and preview the list of pages either on Commons or at a Wikisource in preview
This could be done by (e.g.)
- fetching the string from Commons when (pre)viewing a new "Livre" page at https://fr.wikisource.org (or another ws)
- enabling rendering of <pagelist 1to6=- 7=titre 8to11=- 12=8 353to356=- /> on file description pages on Commons (with some template)
- build a LUA version of pagination string parsing
Maybe this is already somehow included in T253458 or T154413