Customize values in Y

[Tatandiaz13]

Is it possible to add a character in the vertical line?

example:

[Hermanya]

Not right now, but it should be relatively easy. I'd gladly accept a PR

[Manouli]

@Hermanya is there any plan to sort this out? I could really use this right now.

[Hermanya]

Not right now

[vitorverasm]

With #97 this is solved.