help: fetch juz & get ayah or verse by verse mapping

[mrhrifat]

Assalamu Alaikum... I'm trying to fetch & dispaly Juz but I can't understand the route of API. Now I am fetching all Juz by

https://api.quran.com/api/v4/juzs

& I think something I have to do with verse_mapping, but I can't figure out how !

"verse_mapping": {
        "1": "1-7",
        "2": "1-141"
      }

How can I build Juz 1 with this ?