Add an option to wrap <img> into <figure>?

[hrw]

I am using liquid_tags for embedded YT videos (or rather their thumbnails) and 'yafg' Markdown extension to handle images.

This way Markdown snippet:

![NEC PC-8001A with peripherals](/files/2018/07/nec-pc-8001a-700x.jpg "NEC PC-8001A with peripherals")

Turns into:

<figure id="__yafg-figure-12">
<img alt="NEC PC-8001A with peripherals" src="[/files/2018/07/nec-pc-8001a-700x.jpg](view-source:http://localhost:8000/files/2018/07/nec-pc-8001a-700x.jpg)" title="NEC PC-8001A with peripherals">
<figcaption><span class="caps">NEC</span> <span class="caps">PC</span>-8001A with peripherals</figcaption>
</figure>

Which then looks like this (with a bit of CSS used):

figcaption {
	text-align: center;
}

figure {
	margin: 0 0 0.5em 0;
	padding: 0 0.5em 0.5em 0.5em;
	border: 1px solid lightgray;
}

But that's duplication of code in Pelican setup so maybe adding <figure> support into liquid_tags.img would be a better option?