iblocklist don't provide domains/hosts ... they deliver lists with ip adresses, you can't that import via adblock, cause this is a DNS addon and relies on domain blacklists.
Maybe you should check out the early bird "banIP" from me (see banIP support thread), which is IP based and also support iblocklist (only CIDR file format, not P2P).
To be honest, banIP is focused on blocking incoming connections (superseded BCP38) and not to block outgoing ad-related IPs ... still you can configure it like that, but DNS based blocking is much more effective in this regard.