There is a hook for this script_loader_tag. You can use it as below

add_filter( \'script_loader_tag\', \'add_asyn_to_script\', 10, 3 );
function add_asyn_to_script( $tag, $handle, $src ) {
//you can use this to make all async
$tag = str_replace( \' src\', \' async src\', $tag );
// You can use this to make it work as below for a specific script
if ( \'dropbox.js\' === $handle ) 
$tag = \'<script async type=\\\"text/javascript\\\" src=\\\"\' . esc_url( $src ) . \'\\\"></script>\';
}
return $tag;
}

Depending on the functionalities of your website, deferring or loading jquery asyncronously might possibly impact on the way the page is loaded or even break functionality. It may as well run smoothly.

But in order to give you a correct answer I must recommend you not to do it.

Here is some reference if you want to still try

https://wpshout.com/make-site-faster-async-deferred-javascript-introducing-script_loader_tag/