What is wrong with hiding your seed phrase this way

Most people write down their seed phrase and store it somewhere.

But what if you cryptographically created a system that could map a list of numbers to a body of text that would reference your seed phrase?

For example you choose your favorite passage in the bible, and the first word of your phrase is SUN.

You find some occurrence of each letter of SUN in the bible passage. for example, 1,6,4 where 1 is the first letter of the first word, 6 is the 6th letter of the 2nd word, 4 is the 4th letter of the fourth word. Something like this.

The benefit of this is that you could easily store this online if you wished in the cloud or on your phone.

I'm definitely not the first person to think of this. What do you think though?