Yes, it is possible to import directly from ImmobilienScout24.de via the ImmoScout24 REST API and from Immowelt via the Immowelt API. You simply connect ImmoScout24 and/or Immowelt in WordPress with WP-ImmoMakler® and your properties at ImmoScout24 are automatically kept up to date in WordPress. With ImmoScout, you have the option of activating individual properties for your website ("Channel: Homepage") or transferring the entire inventory.
Please note that ImmobilienScout24 has been charging a usage fee for its API since September 2021. WP-ImmoMakler is optimized to keep you in the lowest price tier.