Yes it is possible. Furthermore you can even write a test for it. Suppose that you have a Webview which in textbox written by javascript codes then you need to find location of items with coordinates. Finally you can test it like this;
let textFieldVector = CGVector(dx: 247, dy: 436)
let textFieldCoordinate = app.coordinate(withNormalizedOffset: .zero).withOffset(textFieldVector)
textFieldCoordinate.tap()
app.typeText("your Login username")
Also my medium article can be useful if you proceed test cases for Webviews . Link is here.
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