An example of how to enqueue multiple styles and scripts which include the SRI (sub-resource integrity) tag. This is loosely based on this article, but I’ve tried to simplify the code somewhat, particularly given I may want to include and manage many scripts/styles.

The important thing to note, is the handle specified when enqueuing a style/script, needs to match the handle referenced in the my_add_sri function. Also note, aside from the obvious SRI tag difference, the str_replace method used on scripts in the my_add_sri function, is different to that used on styles.

/**
* Load custom CSS and JavaScript.
*/
add_action( 'wp_enqueue_scripts', 'wpdocs_my_enqueue_scripts' );
function wpdocs_my_enqueue_scripts() : void {
    // Enqueue my styles.
    wp_enqueue_style( 'wpdocs-bootstrap-style', 'https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.2/css/bootstrap.min.css' );
    wp_enqueue_style( 'wpdocs-datatables-bootstrap-style', 'https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.21/css/dataTables.bootstrap4.min.css' );
    
    // Enqueue my scripts.
    wp_enqueue_script( 'wpdocs-bootstrap-bundle-script', 'https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.2/js/bootstrap.bundle.min.js', array(), null, true );
    wp_enqueue_script( 'wpdocs-datatables-bootstrap-script', 'https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.21/js/dataTables.bootstrap4.min.js', array(), null, true );
    wp_enqueue_script( 'wpdocs-jquery-datatables-script', 'https://cdnjs.cloudflare.com/ajax/libs/datatables/1.10.21/js/jquery.dataTables.min.js', array(), null, true );    
    
    // Add filters to catch and modify the styles and scripts as they're loaded.
    add_filter( 'style_loader_tag', __NAMESPACE__ . '\wpdocs_my_add_sri', 10, 2 );
    add_filter( 'script_loader_tag', __NAMESPACE__ . '\wpdocs_my_add_sri', 10, 2 );
}

/**
* Add SRI attributes based on defined script/style handles.
*/
function wpdocs_my_add_sri( $html, $handle ) : string {
    switch( $handle ) {
        case 'wpdocs-bootstrap-style':
            $html = str_replace( ' />', ' integrity="sha512-MoRNloxbStBcD8z3M/2BmnT+rg4IsMxPkXaGh2zD6LGNNFE80W3onsAhRcMAMrSoyWL9xD7Ert0men7vR8LUZg==" crossorigin="anonymous" />', $html );
            break;
        case 'wpdocs-datatables-bootstrap-style':
            $html = str_replace( ' />', ' integrity="sha512-PT0RvABaDhDQugEbpNMwgYBCnGCiTZMh9yOzUsJHDgl/dMhD9yjHAwoumnUk3JydV3QTcIkNDuN40CJxik5+WQ==" crossorigin="anonymous" />', $html );
            break;
        case 'wpdocs-bootstrap-bundle-script':
            $html = str_replace( '></script>', ' integrity="sha512-kBFfSXuTKZcABVouRYGnUo35KKa1FBrYgwG4PAx7Z2Heroknm0ca2Fm2TosdrrI356EDHMW383S3ISrwKcVPUw==" crossorigin="anonymous"></script>', $html );
            break;
        case 'wpdocs-datatables-bootstrap-script':
            $html = str_replace( '></script>', ' integrity="sha512-OQlawZneA7zzfI6B1n1tjUuo3C5mtYuAWpQdg+iI9mkDoo7iFzTqnQHf+K5ThOWNJ9AbXL4+ZDwH7ykySPQc+A==" crossorigin="anonymous"></script>', $html );
            break;
        case 'wpdocs-jquery-datatables-script':
            $html = str_replace( '></script>', ' integrity="sha512-BkpSL20WETFylMrcirBahHfSnY++H2O1W+UnEEO4yNIl+jI2+zowyoGJpbtk6bx97fBXf++WJHSSK2MV4ghPcg==" crossorigin="anonymous"></script>', $html );
            break;
    } 
    return $html;
}