Is your feature request related to a problem? Please describe.

Hi, I want to use hero image which can be fetched by URL e.g. https://.../image.png like this:

---
title: Using Article Hero Image by URL
author: Tanaka Tarou
date: 2020-05-14
hero: https://.../image.png
excerpt: How can I do it?
---

But it end up with,

![image](https://user-images.githubusercontent.co

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