feedback-3.x-dev/config/schema/feedback.schema.yml

block.settings.*:
  type: block_settings
  label: 'Block settings'
  mapping:
    feedback_type:
      type: string
      label: 'Feedback type'
    feedback_help:
      type: text
      label: 'Help'
    feedback_submit:
      type: label
      label: 'Submit button'