Karabiner Swap CMD and OPTION for Varmilo VB87M Bluetooth Keyboard VID: 0x1915, PID: 0xEEEE

private.xml

<?xml version="1.0"?>
<root>
    <item>
        <name>Swap Command and Option for Varmilo VB87M Bluetooth Keyboard (vid/pid: 0x1915,0xEEEE)</name>
        <identifier>private.swap_cmd_option_varmilo_vb87m</identifier>
        <block>
            <device_only>DeviceVendor::RawValue::0x1915, DeviceProduct::RawValue::0xEEEE</device_only>
            <autogen>__KeyToKey__ KeyCode::COMMAND_L, KeyCode::OPTION_L</autogen>
            <autogen>__KeyToKey__ KeyCode::OPTION_L, KeyCode::COMMAND_L</autogen>
            <autogen>__KeyToKey__ KeyCode::COMMAND_R, KeyCode::OPTION_R</autogen>
            <autogen>__KeyToKey__ KeyCode::OPTION_R, KeyCode::COMMAND_R</autogen>
        </block>
    </item>
</root>

This will swap CMD and OPTION for this specific keyboard. You can of course change the PID and VID RawValue to match your own keyboard.