Android Espresso: How do I inspect elements inside a web view?

Question

In the app is a Checkout.com 3DS screen and when I use Layout Inspector (Android Studio), I only see the web view but it has no subtrees. Do I need to use separate software to inspect elements in chrome web view?

I believe I have the correct code to interact with the elements but I'm just guessing the attributes at the moment and not having much luck. Using text/placeholder hasn't worked so far.

private val webView = withId(R.id.verifyByThreeDsWebView)

override fun isDisplayed() {
    support.waitForViewDisplayed(webView, 20000)
}

fun enterPassword(password: String = "Checkout1!") {
   onWebView(webView).forceJavascriptEnabled()
       .withElement(findElement(Locator.XPATH,"//*[@placeholder='Hint: Checkout1!']"))
       .perform(webKeys(password))
}

fun clickSubmit() {
    onWebView(webView)
        .withElement(findElement(Locator.XPATH,"\"//button[contains(text(),'Continue')]\""))
        .perform(webClick())
}