In short: its on the road map!

The high level api is designed to be agnostic to it, although there will probably be some hold ups. It's written in C89/90 and compiler enforced but I currently use CMake as the build system but it shoudln't be hard to transition to a native compiler. mbedTLS is currently an optional back-end for this reason

One of the largest is that it depends on libsecp256k1, which requires over 1mb of data segment for lookup tables, which is just way too much for most MCUs.