MacOS Key Remap

net.olfway.UserKeyMapping.plist

<!--
  Put this file in ~/Library/LaunchAgents/net.olfway.UserKeyMapping.plist to remap CapsLock to F19.
  See https://developer.apple.com/library/archive/technotes/tn2450/_index.html for details.
-->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>net.olfway.UserKeyMapping</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/bin/hidutil</string>
        <string>property</string>
        <string>--set</string>
        <string>{"UserKeyMapping":[
          { "HIDKeyboardModifierMappingSrc": 0x700000039, "HIDKeyboardModifierMappingDst": 0x70000006E }
        ]}</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
</dict>
</plist>