We were just talking about this in the surge slack (in surge 1.6.5 coming soon I have added support for kbm files so we needed a lot of testing). While it doesn’t seem as good as Scala, someone pointed me to https://sevish.com/scaleworkshop/ which may help, and just requires a web browser.
And if it is of interest, if you download the latest surge vst nightly and just edit your scale in emacs or vi, surge will show you the entire frequency map across the keyboard in the scale display.
I know it’s not exactly an answer to your question but hope that helps
And there is Custom Scale Editor (https://hpi.zentral.zone/cse). Price: 25 euro.
You can import and edit tunings, and make scala (or tun) files with it.