How to load css link into the head tag?

Hello, First of all, thanks for contributing such an amazing js framework. I am very new to grapesjs. And github too.

canvas: {
    scripts: ['https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js']
  }

https://github.com/artf/grapesjs/wiki/Components-&-JS#template-related According to grapesjs wiki, I load js links inside the canvas as the above codes and it works fine.

But when I try with css links like this, it doesn't work.

canvas: {
      links : ['https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css'] 
  }

Some people here suggest to add those CSS links directly under the id="gjs". I did it but what happen is if I clean the canvas, it also clean my css links and CSS doesn't work anymore. My question is how can I load CSS link into the head tag?