\Drupal\Core\Field\FieldTypePluginManagerInterface has a new method: getEntityTypeUiDefinitions

Drupal 10.2.0 added a new API for modules for modules to dynamically alter field definitions used for rendering the UI. In Drupal 10.3.0, \Drupal\Core\Field\FieldTypePluginManagerInterface has now a new method that can be used for retrieving the entity type specific UI field definitions.

Example:

$field_type_manager = \Drupal::service('plugin.manager.field.field_type');
$definitions = $field_type_manager->getEntityTypeUiDefinitions('node');