如何在AWS DynamoDB上将值附加到list属性？

I'm using DynamoDB as an K-V db (cause there's not much data, I think that's fine) , and part of 'V' is list type (about 10 elements). There's some session to append a new value to it, and I cannot find a way to do this in 1 request. What I did is like this:I'm using DynamoDB as an K-V db (cause there's