If the exposure metering numbers are not displayed there by default, I'm sure you can turn them on in menus. But that's not my point.Using an EVF doesn't rob you of the ability to view exposure guides such as a histogram though, I'm not sure if there is an exposure meter in the R or RP viewfinder?
If you can trust your camera's exposure meter and you see the whole scene in the viewfinder, you can point the camera to some exposure anchor in the scene, press the AE lock button, recompose and shoot. With the current EVFs, you may need a lot of fiddling just to see where your exposure anchors are.
A histogram can be useful, but definitely doesn't solve all the problems. There are other EVF logic improvements possible to address this need; they are not that hard technically to implement, but they are not there yet.