Well would need a 'database' of houses. Ie the mapped houses.
For some countries that might be available from various suppliers. Or maybe they been mapped in OpenStreetMap (if in OSM, could be extracted/copied).
(Note even if Google has a database for the location, you can't download Google's database. It might or might not be 'owned' by Google, possibly they purchased it from elsewhere, and dont have a licence to allows others to obtain a copy 'freely'. )
Once have the database its a programmer/developers job to use a Maps API or 'GIS' system to plot them on a map. (that Maps API or GIS system, could also incorperate displaying a lat/long or Plus Code based grid)
Well again it comes down to having a 'database' of houses. Its common that such databases would contain coordinates (particularly if a 'mapped' database) - Plus Codes itself is a 'known algorithm', so can then calculate the Plus Codes from those coordinates. (ie a 'process' could run yourself with suitable scripting/program)