How can I turn on a looking-at coordinates display?

In Minecraft: Education Edition, I'm trying to build something for someone; how do I see the coordinates of the block I looking at? I can't turn debug mode on like in Java Edition so is there another way to do it?

Coord

Looking at a block and opening the chat, then typing /setblock but don't hit enter! The autocomplete will show you the x, y, and z.

The more efficient option is to run /gamerule showcoordinates true and do some math or stand on the block.

/fill ?

Let's say you wanna easily /fill an area. Stand on one corner, then either remember or write down it's coordinates displayed to you by /gamerule showcoordinates true.

Then go to the other corner, look at the block, and type /fill and press Tab three times. Then just type the earlier set of coords and complete to command.