[Question/Request for feature] - Prover for plonk

I noticed the prover is only available for groth16, but not for plonk/fflonk. 

Although here polygon has made its own implementation of rapid snark for fflonk: 

- https://github.com/0xPolygonHermez/zkevm-prover/blob/main/src/rapidsnark/fflonk_prover.c.hpp

Is there a reason to not make in rapid snark and just in snark js? 

Thanks in advance!