Is thera a way to add a featured images in posts / pages?

[sod]

I think support for YAML front matter might arrive someday. Here’s @manton in another thread:

Posts frontmatter and image display

This isn’t possible right now because Micro.blog manages the frontmatter for you. If all your posts are in Portuguese, you can use a custom theme to set the language everywhere, but not on a per-post basis. This is something we need to fix. We’ve talked about having some kind of interface for adding custom fields to the frontmatter. Another work-around would be to use categories like “English” and “Portuguese”. Then you could edit the templates in your theme to show the flag if the category wa…

Until then, here are some ideas for workarounds:

• You can add blog posts and pages via themes and plug-ins. So, you could have a my-blog-posts-plug-in containing all (or some) of your blog posts. That way, you get access to the YAML front matter. Here’s an example “blog post” from one of my plug-ins. Having to update a plug-in to write a blog post is tedious, though, and kind of misses the point of easy blogging via Micro.blog. (You could just host a Hugo or Elevently blog yourself in that case.)
• You can have your theme look for the first image in the blog post, as @yurymol already suggested.
• Or, you could have your theme look for some “magic” HTML and infer the featured image that way. For example: Hey, this is my short blog post with additional <data id="featured-image" value="/uploads/2023/abd45e7e85.jpg">data</data>.
• Instead of via HTML, you could provide the featured image via a Hugo shortcode. Something like: {{< feature_image "/uploads/2023/abd45e7e85.jpg" >}}. And have your theme parse that.