You can't unless the tools you're using to display tabs do it like this. None do, apart from the proof of concept programs on the site.

But it is a cool idea.

It's not "solved." Not trying to dive into yet another tabs vs. spaces argument. But this is just another example of how tabs can be pretty neat when they're interpreted in a specific way. But it's up to your editor, plugin, etc. to do so. Take the same text and throw it into an editor that doesn't use this same interpretation, and it immediately falls apart.