Hi,
As far as the document below is concerned, it seems that the SN74AVC8T245 can be used to convert the signal level of RGMII.
https://www.ti.com/lit/ml/scea118/scea118.pdf
I am currently considering connecting 1.8V from different sources to VCCA and VCCB. I'm concerned about the skew when using the SN74AVC8T245 to convert the levels of RGMII's CLK, CTL, and DATA. Please let me know if you have a track record of converting RGMII signals with a custom board.
Thanks,
Conor