Loading ChartJS in a Virtual Dom Using DocumentFragment is not "Working".

Using this :

 let myChart = new Chart(MyDocumentFragment, {....})

MyDocumentFragment is a "virtual" canvas selected with querySelector inside my Fragment.

Node is found, no error, but when I console.log my Fragment, Canvas is not initialised (no Width, no height etc...), I need to Append my Fragment to the DOM so that the Canvas get initialised

Any way to fully load my Canvas ChartJS inside my Fragment before Append it to the DOM ?