Using someone else's /etc/pihole/adlists.list

[yubiuser]

@walksonair

/etc/pihole/adlists.list

This file is obsolet since v5 and has been replaced with the gravity.db. You can inject adlists via Sql. See here

Managing Ad lists in 5.0

You could try to inject your addresses via sql directely into gravity.db adlist table by something like sudo -u pihole sqlite3 /etc/pihole/gravity.db 'insert into adlist(address, enabled,date_added, date_modified,comment) values ("test.domain", "1", strftime("%s","now"), strftime("%s","now"), "comment");' and run pihole -g afterwards. Maybe best would be to put it into a script, start a sql transacrition, interate through your list of adlists to add and finish the transaction.