The main obstacle in developing such software is not its complexity, but the fact that the FPGA manufacturers do not document the format of their bit streams that must be used to program a FPGA.

It is the same like the difficulty of making a compiler and assembler for a CPU for which the manufacturer does not document its machine language (like the NVIDIA GPUs, but at least NVIDIA documents an intermediate language that you can use as a target for your compiler, while the FPGA vendors do not document anything).