Way to update unencrypted placeholder value with eventSubscriber

Problem/Motivation

With https://www.drupal.org/project/field_encrypt/issues/3185310 → issue hook was removed from getUnencryptedPlaceholderValue method. Now we can use field settings to add as unencrypted value. But I have case were I need different result for every field value.

Proposed resolution

I would like to propose bringing back same way as with hooks. Just maybe better with event subscriber