I used some barangays to trace some admin boundaries. I already added 10-digit PSGC and population for all barangays in Tayabas from https://psa.gov.ph/classification/psgc/?q=psgc/barangays/0405647000, then searched it by "is_in:city=Tayabas" then I traced it between the barangays that are in different cities or municipalities.