Here lives a freshly and often updated list of bogus domains containing linked to the Covid-19 outbreak.
https://blacklist.cyberthreatcoalition.org/
Also on Github. I think that is easier to add to your pihole.
Maybe someone has an advantage to know this
More resources to protect against COVID-based phishing attacks:
https://blacklist.cyberthreatcoalition.org/ (and see this tweet for background and a slack useful for people tracking/responding to COVID-focused phishing: https://twitter.com/ThreatCoalition/status/1244340555007614976 )
Also - an export of frequently updated rules for IDS (e.g. suricata) https://d82pn7cft47ne.cloudfront.net/MISP-COVID.rules