Sorry for the delay in replying.
Bible readings has been a feature for a long time. Originally it was just a CSV upload for the app. In recent years it uses the Bible Readings custom post.
The default is the Bible In One Year plan (used by Nicky Gumbel’s BiOY app – the Alpha course people)
You can create your own plans, either by creating posts with notes in Bible Reading post type or by uploading a CSV. The spreadsheet works by a row per day. And a column per Bible Reading.
On the Premium Church Admin> Settings> Bulk Bible Reading Publish menu item.
More detail, a sample CSV and screenshots are at https://www.churchadminplugin.com/tutorials/bulk-publish-a-bible-readings/