This module provides a Form API element to select a Media entity from the Media Library. This element can be used in all standalone forms. I'm currently using this in a Paragraphs behavior form to select a background image with crop-support, but you can use it in a Layout builder form, or a configuration form under "Settings"...

The implementation is borrowed from the Media Library widget and follows its user interface as well as its possibilities:

You can limit the allowed media types by passing the machine names of those media types
The default value is either:
- Empty: NULL
- a single Media entity's ID: (int) 1
- multiple Media entity ID's separated by comma as a string: (string) 1,2,3,4

$form['image'] = [
  '#type' => 'media_library',
  '#allowed_bundles' => ['image'],
  '#title' => t('Upload your image'),
  '#default_value' => NULL|1|'1,2,3',
  '#description' => t('Upload or select your profile image.'),
];

I chose to release this as a standalone module so anyone can review / contribute / fork / ... without having to wait on the official core patch (https://www.drupal.org/project/drupal/issues/3065677).

Feel free to test-drive, suggest improvements or post bug reports should you encounter any!

All features have been implemented thus far, so if anyone lacks something, feel free to create an issue!

RTBC issues for Media Library Form API Element

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