You could always get an HDMI to Display Port cable depending on the monitor.
As an example, I have a gaming monitor that has DP and supports variable refresh up to 120hz and is 3440x1440p. Granted, it's also an ultrawide and I don't know if consoles support that.
However, there are some that are over 34" and 4k HDR, but don't have HDMI 2.1. They do have DP 1.4 which supports everything. See below.
https://www.newegg.com/p/pl?cm_sp=CAT_Monitors_1-_-VisNav-_-Gaming-Monitors_1&N=100898493 601322279 600338147