Hello,
has been a year since 2023 but let's reply anyway:
There's no direct method right now (no automated tool created at present time) to fully understand Apache's .htaccess format, which is more complex than just URL rewrites.
However you will probably benefit from using third-party Apache utilities such as DA-HtAccess (not free,there might be alternative freewares on Github):
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https://da-software.net/en/software/da-htaccess/
These GUI tools for Apache HtAccess will display what the URLRewrite rules are inside and help you understand them visually, so that you can replicate these easily in Abyss Web Server yourself.
So the solution right now is to feed your .htaccess to Apache GUI tools, view what the URLRewrite rules are and replicate them in Abyss ourselves.