when set both
echoMode: TextInput.Password and
inputMethodHints: Qt.ImhDigitsOnly in Android
for TextField, I get not Digital Keyboard, but AlphaNumerical

Without echoMode: TextInput.Password shows up right keyboard

TextField{
text: ""
inputMethodHints: Qt.ImhHiddenText | Qt.ImhDigitsOnly;
echoMode: TextInput.Password
}