epub could be a good candidate for being converted into e-Sword.
sorry, I cannot go into details, as it depends on how your file is formatted.
In Mac, it can be as easy as just a few steps listed below:
- open terminal, type “unzip filename.epub”
- type “cat *.html > file.csv” to combine all html files within the epub in a single file.
- edit “file.csv” with a simple text editor to capture verse entries for each commentary, it could be quick if the source if well-formatted
- import into a .bbli file, which work in Mac/iOS/ PC version 11+