Alter the information provided in \Drupal\paragraphs\Annotation\ParagraphsBehavior.
$paragraphs_behavior: The array of paragraphs behavior plugins, keyed on the machine-readable plugin name.
function hook_paragraphs_behavior_info_alter(&$paragraphs_behavior) {
// Set a new label for the my_layout plugin instead of the one
// provided in the annotation.
$paragraphs_behavior['my_layout']['label'] = t('New label');
}