TYPO3 Core

I tried to use an .env-variable in `newsletterPopup.form.yaml'.
The variable 'TYPO3_EMAIL_NEWSLETTER_RECIPIENT' works in other yaml-file, which use the YAML-API.
https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Yaml/Index.html

renderingOptions:
  submitButtonLabel: Submit
type: Form
identifier: newsletterPopup
label: NewsletterPopup
prototypeName: standard
finishers:
  -
    options:
      subject: Newsletter-Anmeldung
      recipients:
        %env(TYPO3_EMAIL_NEWSLETTER_RECIPIENT)%: 'newsletter-Anmeldung'
      senderAddress: '{email-1}'
      senderName: Newsletter-Anmelder
      addHtmlPart: true
      attachUploads: true
      translation:
        language: Default
      useFluidEmail: false
      title: 'Hallo {email-1},'
    identifier: EmailToReceiver
renderables:
....