multiple sources (sanity.io + MDX) into a single rss.xml with gatsby-plugin-feed?

[ajmalafif]

hey all,

Is it possible to combine allSanityPost and allMdx for gatsby-plugin-feed and have it spits out both content into a single rss.xml?

I only managed to create 2 separate feeds for both MDX and Sanity instead of combining them both into one here: https://github.com/ajmalafif/afif.dev/pull/46

Appreciate any help or pointers thank you!