I use .MKA files to store multiple common files together - unique song playlists and audiobooks. These files show up under a music library, but I’m unable to select chapters from them. Was hoping that chapter support could be implemented, especially since it’s the same programming as MKV chapters.
In addition to Otto‘s point and the wider dependency… there’s already an existing suggestion asking for the exact same feature (also with no votes so far). So in case you want to keep the suggestion purely about the aspect of having chapter support for those particular audio file formats (instead of the use case), please comment/vote in that thread to help us avoid distracting or cannibalizing votes.