Simply go the the layout and use the change tool to draw a cloud round the altered area. The change, if it is new, will then be added to the layout revisions the same as if you added it to a view.
As long as your displayed views don't move about you should be ok but the change cloud and model aren't linked so if the part of the model you are displaying shifts, the cloud will unfortunately stay in it's original place on the layout sheet.
Apple iMac Intel i9 / macOS Sonoma / AC27UKI (most recent builds.. if they work)