given a webmap, how to find each layer's item page on portal
https://gis1.victorvilleca.gov/portal/home/item.html?id=2543b84e5f2547afa773ce9e6a8f7551
This is weblayer (feature layer) item page on portal
https://gis1.victorvilleca.gov/portal/home/item.html?id=4f1531b032f547f08c6fb87fe09f6349#overview