Option for custom demo link for themes

Currently, a demo version of our themes gets hosted by default on Hugo themes site. As useful as it may be, it still isn’t perfect because the themes in the hugo-themes repo don’t get updated on the go(they are updated usually on a weekly basis). I’d love if there was an option in the theme.toml file which would allow the authors to provide their own theme demo link, for example, I have set up netlify so that it is always in sync with my theme.
I also think that providing a separate demo link in the README.MD file isn’t neat.