I want to use "s + hjkl" to map to arrows , can it be possible ? and how ?
I think you're waiting for issue #16 to be addressed; currently not possible, but might be in the future. Hopefully in the short-term future :)
No, that's a different issue; it's addressing the inverse of what @Menq is asking for. Karabiner used to have this legacy functionality, but I'm not sure if there is a private.xml to edit anymore. This article describes it: https://coolaj86.com/articles/home-row-arrow-keys-on-os-x-with-karabiner.html
@wwwjfy could help us, he's already done the inverse (mapping one key to multiple).
working sample: https://pqrs.org/osx/karabiner/complex_modifications/#vi_mode
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working sample: https://pqrs.org/osx/karabiner/complex_modifications/#vi_mode