How to do partial spoiler at drama review, on Android App ? (Gray color over text)

How to do partial spoiler . ? On Android??

The Gray color over text. When you select its readable. 

Example:  

Hello this is my drama review.

This is spoiler **female lead will die at ep12**.

Now i continue  review spoiler free

Yeah.. .  but it's not available on  drama review page

Example :

goto a drama Page,   reply 1988.

Press add a review .  

There is no ⚠️ selection  spoiler icon there..