Any suggestion how to collect non-native blocklists?

What is the best approach to building target lists?

My guess is that transferring the formatting to the target list format is a big stumbling block for many.  In the past I have used MS Power Query Editor to deal with formatting alignments.

Does anyone have any suggestions on the best way to find, reformat and connect existing lists to the Firewalla Target Lists?  Seems connecting to curated lists is a critical aspect of Target List functionality