<hr class="wp-block-separator has-cyberspace-color alignleft ">
<hr class="wp-block-separator{{#if color}} {{color}}{{/if}}{{#if modifier}} {{modifier}}{{/if}} {{#if class}} {{class}}{{/if}}">
{
  "color": "has-cyberspace-color",
  "modifier": "alignleft",
  "class": null
}

Note!

Component is using block classes from wordpress instead of Atomic Design methodology