Add a file (picture) via REST GET from Website to Picture field

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Hi there.

before I search forever; has anybody a hint how I could define an action (Invoke REST Web Service) where I can read a picture from an URL ( e.g. https://qr.myurl.com/wp-content/uploads/qyrr/177/qr-code.png)via GET and store it in a picture field?

Thanks in advance!
Klaus