I have no experience with Known CMS but Micro.blog has support for importing content from Instagram, WordPress, Medium, and Markdown files. There are links to the different options from the table of contents.
Unless Known CMS can export to one of these “formats,” you could:
- Convert the Known CMS export to another format, like Markdown files. Maybe there’s a ready-to-be-run script out there, our you will have to produce your own.
- As you’ve mentioned yourself, you could write a script to import the content using Micro.blog’s API.
- I don’t know, but maybe WordPress can import content from Known CMS? If so, you could temporarily set up a WordPress blog, import your content there, export it from WordPress, and import it into Micro.blog.
