The best route would be to use a custom EDL.
If you want the IP's to be considered to be added to the list for every Palo Alto Networks customer, you can submit a Support case and request the IP's be evaluated to be added to the high-risk IP pre-defined EDL, but based on experience there's an extreme vetting process to move IP's to the pre-defined list, and many you consider curated may not make it to the list.
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