w-mode in karabiner

karabiner.edn

{
    :simlayers {:w-mode {:key :w}}
    :templates {:open "open -b %s"}
    :main [
        {:des "w layer"
          :rules [
            [:h [:open "io.alacritty"] :w-mode]
            [:l [:open "com.google.Chrome"] :w-mode]
            [:e [:open "org.gnu.Emacs"] :w-mode]
            [:i [:open "com.tinyspeck.slackmacgap"] :w-mode]
          ]}
    ]
}