Custom size

I want add custom size for every smile by attribute (like bbcode) 
`[emojiname-size]`
And this should look like image with `width=size` and  `height=size`
`<img class="emoji" alt="emojiname" src="path/emojiname.png" width="size" height="size">`
Sample.
`[fun-30]`
Must replace with:
`<img class="emoji" alt="fun" src="path/fun.png" width="30" height="30">`
Is that possible?
