li::marker Workaround

CSS
ul.wp-block-list {
	margin-left: 0;
	padding-left: 1em;
	list-style: none;
}

ul.wp-block-list li {
	position: relative;
}

ul.wp-block-list li::before {
	content: "> ";
	position: absolute;
	left: -15px;
}