Testing Accessibility on Emulated Device (Marshmallow)

Question

I want to test the accessibility of my app in emulator (particularly Talkback) but it seems that the option is missing in emulator. Here is the screen shot from

Answer 1

but can it be turned on ? I was able to adb install from this site https://rileymacdonald.ca/2018/09/07/android-test-talkback-accessibility-android-emulators/ but Settings ->Access