Accessing a detached overlay view (android) with Appium

TL;DR:

It would be great if Appium would have a command to find and even access overlays (android views that were added dynamically with WindowManager).

Longer version:

I have an android application in which I pop up an overlay window. This is done by calling:

myWebView.loadUrl("someUrl");
windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);
windowManager.addView(myWebView, layout);

And I want to test that the overlay is displayed successfully, and also that I can perform actions in it (example scenario: there is an X button inside that web view, and clicking it should close the overlay).

I tried to use Appium inspector / android uiautomator and neither was able to detect the webview on the screen at all. I’ve also tried to use myWebView.setContentDescription("some_tag") to label the view and then access it with driver.findElement("//*[@content-desc='some_tag']") but it didn’t find it.

I’ve found that the following ADB command can indicate wether the overlay is present:

adb shell dumpsys window windows | grep "package=myPackage appop=SYSTEM_ALERT_WINDOW"

But this would be a fragile solution, because I will probably be counting on running an external process in my test, not to mention that it depends on grep (can be easily transferred to JS).

I couldn’t find anything similar in Appium. Can this ability be added? To query for WindowManager’s dynamically added views, and even provide selector-based access to them?