Level 75
In laravel mix copy that file to the public folder
mix.copy('node_modules/webchords/tab-chord.html', 'public/html/tab-chord.html');
Then use asset() helper
<link rel="import" href="{{ asset('html/tab-chord.html') }}">
Docs: https://laravel.com/docs/7.x/mix#copying-files-and-directories