r3_support_rza1-0.2.2 doesn't have any documentation.
Supporting package for running [R3] on a Renesas RZ/A1x family MPU
(including [RZ/A1H], which is used by the [GR-PEACH] development board).
[R3]: ::r3
[RZ/A1H]: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz/rza/rza1h.html
[GR-PEACH]: https://www.renesas.com/us/en/products/gadget-renesas/boards/gr-peach.html