I only saw it on 8PC
Does this feature exist in the variant?

Click on the cog icon next to the board, enable keyboard shortcuts, and then press the "K" key. You should be able to see the coordinates.

I only saw it on 8PC
Yeah, as a 8PC admin I can verify, our website has that feature, but since we are not part of variants I don't think we really count, but Variants has it, like @TheCheesePhoenix said.

Click on the cog icon next to the board, enable keyboard shortcuts, and then press the "K" key. You should be able to see the coordinates.
that doesn't appear

Click on the cog icon next to the board, enable keyboard shortcuts, and then press the "K" key. You should be able to see the coordinates.
that doesn't appear

Click on the cog icon next to the board, enable keyboard shortcuts, and then press the "K" key. You should be able to see the coordinates.
that doesn't appear
The OP is asking for a feature that allows coordinates to be shown when the mouse hovers over a square

Click on the cog icon next to the board, enable keyboard shortcuts, and then press the "K" key. You should be able to see the coordinates.
that doesn't appear
The OP is asking for a feature that allows coordinates to be shown when the mouse hovers over a square
That's exactly what he's showing?
Press the settings/cog button, and turn on "Enable Keyboard Shortcuts"
Press the key K in a game or in analysis, and then then coordinates will show up when you hover over them.
Does this feature exist in the variant?
For example, if I put my mouse in cell e5, it will show the word e5