after reading up the v6.0 Handbook on Fabric connectors, I'd say that in that version you can not use the imported list in IPv4 policies directly (that is, in the source or destination address field). If a DNS filter would suffice, you can do that in v6.0. It will block the IP resolution of FQDNs used for HTTP(S) policies.
Without really being ashamed, I'd like to point to my blog where I offer a Python script for importing arbitrary long IP lists into IPv4 address objects and address groups (https://www.beneicke-edv.de/?page_id=999#ext_blacklists). Maybe it's of help for you, though it's not as elegant as a Fabric connector, as you'd need Python installed and the objects are not updated dynamically.
"Kernel panic: Aiee, killing interrupt handler!"