gridjs-vue can't render HTML

Question

I'm using gridjs-vue 4.0.0 with vue 2.0. For some reason I can't render a HTML in the content. Here is my code:

    import Grid from 'gridjs-vue'
    export default {
        components: {
            Grid
        },
        mounted() {
            console.log(this.$gridjs); //this return 'undefined'
            },
        data () {
            return {
                cols: [ 
                      {
                        name: 'tester',
                        formatter: (cell) => {
                            return this.$gridjs.html(`<b>${cell}</b>`) //this line return error
                        }
                    }
                ],
            }
        },
    }

The log error is: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'html')

Any suggestions? Thanks