Low level library NRF52

var ll = require("NRF52LL");
var saadc = ll.saadc({
  channels : [ { // channel 0
    pin:D29,
    gain:1/4,
    tacq:40,
    refvdd:true,
  } ]
});

setInterval(function() {
  print(saadc.sample()[0]);
}, 250);

How do i change the resolution to 10 bits and Internal reference ?