tl;dr: Slite supports import/export Markdown files, so not a native "interop".

Links: https://slite.slite.page/p/5XOO7_tII0D87T/Importing-Files, https://slite.slite.page/p/PxKfPvLrLHj07O/Exporting-Your-Doc...

Recommend trying it for some personal notes/specs/etc. -- can be used independently.