no. not possible. And if you want to request a new feature then you will have to send feedback from samsung members app. posting it here won't help you. Samsung team doesn't reads the posts shared in community. And even if you send feedback Samsung won't add this feature on demand of one person.
Double tap is a basic feature but Samsung doesn't provide in M20 , while M30 has (although M30 runs on same same processor same Android version like in M20)
