For the edit mode, since the context menu of the ordinary text content has already support a simple copy function, I think it may be possible that let the context menu for backlink directly “inherit” part or all of the options within the ordinary context menu.
For the graph vie, a new option named “copy the name of the node” may be added into the context menu.
Current workaround (optional)
for edit mode, selecting the text of the backlink and press the copy hotkey(ctrl/cmd+c) will copy