Add field in config to attach library

It will very helpful if we can get list of all libraries in block config page and select library according requirement.

But alternate solution may be as -
1. Use classes and detect class in template file and attach library
2. Create select list and attache library by conditional checking in block type template file.

Do it simple like https://www.drupal.org/project/views_attach_library →
(This works with block views)
Sometimes I just need to add my custom library in a block for example: my_custom_module/my_lib1, my_custom_module/my_lib2
it will add
$element['#attached']['library'][] = 'my_custom_module/my_lib1';
$element['#attached']['library'][] = 'my_custom_module/my_lib2';
my custom library will add custom css and custom js. it will be very useful

Can you add me to maintainer with full right, pls? I will add this feature to version 2.x

I make add library patch for 1.x. please add to 2.x