EditorConfig - mawww/kakoune GitHub Wiki
For editorconfig support, you will need to install the CLI tool.
On debian/ubuntu:
apt install editorconfig
You can put the following line in your kakrc:
hook global WinCreate ^[^*]+$ %{editorconfig-load}
That will set options from editor config for every real file you open in Kakoune. Non-file buffers such as *debug* are ignored.