Unable to use SVG in markline label.formatter

Code:

	markLine: {
							
	symbolKeepAspect: true,
	symbolSize: [20, 20],
	label: {
		position: 'insideEndBottom',
		distance: 10,
		formatter: function (params) {
			return `<svg class="svg-icon" viewBox="0 0 20 20">
				<path d="M15.475,6.692l-4.084-4.083C11.32,2.538,11.223,2.5,11.125,2.5h-6c-0.413,0-0.75,0.337-0.75,0.75v13.5c0,0.412,0.337,0.75,0.75,0.75h9.75c0.412,0,0.75-0.338,0.75-0.75V6.94C15.609,6.839,15.554,6.771,15.475,6.692 M11.5,3.779l2.843,2.846H11.5V3.779z M14.875,16.75h-9.75V3.25h5.625V7c0,0.206,0.168,0.375,0.375,0.375h3.75V16.75z"></path>
			</svg>`;
			},
		fontSize: 10,
		fontWeight: 'bold',
		borderWidth: 1,
		borderRadius: 5,
		padding: 5,
		rotate: 360,
		backgroundColor: '#fff',
	},

	data: [
		{
		xAxis: new Date().getTime(),
		},
							
	],
},

I cant get any svgs to work and would appreciate any help possible.

What I'm trying to make:

Using SkiaChart for this if that matters.