On Apple Maps, use the "report a problem feature". A team of underpaid contractors in Seattle will adjust it in OpenStreetMap, and Apple Maps will ingest the data after a few weeks.
Do you happen to know how that ingest works? There are some foot paths near my house I put in and fixed over the years and none of them are in Apple maps. Does it only ingest the changes the apple team makes?
They're interested in street-level roads and higher, as well as POI. Stuff that would support turn-by-turn directions. I'd suspect that if they are foot paths, then they aren't prioritizing non-roads/streets.
t. worked on this terrible team