Show numbers of selected lines or characters

On the top-right corner of the editor, we can see our current line and column. It would be better if it includes how many lines or characters the user has selected.

From the screenshot below for example, if one selected 100 lines, it can display as "Line: 6855 (100)", to indicate that the user has currently selected 100 lines.

There's a similar behaviour at the bottom bar of CotEditor on macOS, which is my daily driver for text editing on my Mac.