The data at the wiki basically is provided by ZOs in the ESOUIDocumentationPxx.txt files they provide us at updates/API version increase.
Some additional data like textrues or sounds are read from the global ingame variables then.
Scenes are not in there so you need to check the scenes ingame either by using a tool like merTorchbug or ZGOO and inspect SCNENE_MANAGER.currentScene e.g.
Or you can have a look at the ESOUi source code to get some of the scenes defined by searching the files for SCENE_MANAGER:OpenScene or just SCENE_MANAGER or similar.
Here is a file of the ESOUI sources containing some of the scenes which are defined:
https://github.com/esoui/esoui/blob/...gamescenes.lua
Others are defined in the ingame folder subfolders, like ingame/inventory will most like contain the inventory related (maybe also bank) scene etc.
https://github.com/esoui/esoui/tree/...0/esoui/ingame
Hint: There most of the time exist own scenes for keyboard or gamepad mode.