Post-holidays I've had time to dig deeper to see if I could find an ebook edition. But there doesn't seem to be one. There is no info on the author's web site about other formats than Kindle and printed-on-paper editions. So my hunt had to end empty handed regarding ebook info.
Rainbow Award for Best Lesbian - Fantasy, and Best Lesbian Book (3rd place) (2017)
Winner: The Standing Stones: The Chronicles of Caymin by Caren J. Werlinger
Link to the award announcement can be found here.