Hi KH,
If I understood the query correctly you want to know if the AXI manager supports RGMII interface. Based on the documentation (https://in.mathworks.com/help/hdlverifier/ug/new-fpga-board-wizard-reference.html#buqnn9v), RGMII is mentioned as a supported interface for FIL (Gigabit Ethernet, Altera Boards).
However, for FPGA data capture and AXI manager, only GMII, MII, and SGMII interfaces are explicitly supported, as stated in the documentation.
Since your FPGA only has an RGMII interface and AXI manager does not officially support it, you may need to consider alternative approaches like using an RGMII-to-GMII bridge or third party ethernet stack.
Hope this helps!