You can query an EDL for its contents using an operational command via API.
Documentation on using operational commands via API:
The operational command you would pass as the 'cmd' parameter in the API call is:
<request><system><external-list><show><type><ip><name>Your EDL Name</name></ip></type></show></external-list></system></request>
PAN-OS 8.0 has a bug where that API call only returns the first entry in the EDL. This is being worked on now, and I'll post here which version contains the fix.
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