How to add custom config values and use them in ghost themes

Themes
1

Is it possible to add custom config values in ghost themes, is there any alternative if this is not possible, for example I want to add configurable social links in my theme file.

Thanks

2

Unfortunately only the posts_per_page property is passed from the config.

An alternative I can think of is creating a json object and generating(changing) the content with javascript.

<script>
  let config = {
    facebook: 'link', 
    twitter: 'link', 
    youtube: 'link'
  }
</script>

You can later use these properties to change the href attributes of your social links or generate them with js.