Why Hugo seams to be unexpendable such as no plugin are available and or hard it would be to make this RSS migrator with hugo ?
such as if you are a dev how much would you charge ?
What are you trying to achieve ?
Hugo has a different approach from hexo. Looks like that migrator plugin just parses the rss, and creates a markdown file for each item.
You could do it generically using python or many other languages a la: https://gist.github.com/rebornix/5363138
Or experiment with rss feed readers to see if one doesn’t offer export to something that you can work with, like csv.
The cost of dev has to be proportional to the number of entries you need to create automatically, and assuming it’s content you own and not content you’re trying to scrape (of course not, right?), you have access to the originals anyway?