1 Download the addon file from the link below.
2 Install the addon. See Blender.org official documents.
3 The setting of the nudge distance appears inside the "Item" panel in the sidebar of the "3D Viewport".
4 Select the target objects and input the shortcuts. Or, you can call the pop-up panel in the header menu "Object" (or "Mesh" in edit mode) > Transform > Nudge. In this way, it just calls the panel, does not move the targets.