Using GraphQL and handling images

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I will update this post in a moment, but I will first make a quick first version of it:

I was using a general graphql plugin to get the content (markdown which was converted into html) into a Gatsby site. I tried several plugins to handle the images in that markdown code so that Gatsby would generate all the images for different sizes & formats, but I failed with this. Generating images worked for strict image fields ("hero" image), but I could get it to blog post content, which is, like I said, general markdown code.

What might be the current status, is there a way to handle images from a general markdown code, fetched with a general graphql plugin?