Why gatsby-transformer-remark do not support remark plugins as mdx do?

[diauweb]

While gatsby-plugin-mdx can load gatsby-specified plugins, remark plugins and rehype plugins, gatsby-tranformer-remark only supports to load gatsby-specified plugins, which is really limited somehow.

What is the purpose of dropping supoort of standard remark plugins, and if there's a way to convert it into a gatsby version, can someone point it out in the documentation?