How to generate a new LTC address with this API ?

[shamoons]

I don't believe you can. This is for reading from the blockchain only. For interacting (via JS anyway), you'll need https://github.com/litecoin-project/litecore-lib

Using that, you can do something like:

const litecore = require('litecore-lib');

function createAddress() {
  const privateKey = litecore.PrivateKey();
  const address = privateKey.toAddress();
}