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Logic analyzer via GPIO pins

Are there any plans on creating software/firmware to use GPIO pins with some kind of logic analyzer (such as sigrok)? Or would it be possible to create such software with plugin system (does it support setting custom USB descriptors/endpoints/clock frequences/stm32 timers)?
I know about SPI/UART/I2C to USB converter feature but it would be really cool to analyze any protocol via existing software and decoders.