[utsahi]

Not sure if this addresses the speed issue, but here is one such tool https://asciiflow.com/#/ The download arrow lets you copy to clipboard.

And if you are an emacs user, you can try the artist-mode to draw with the mouse.

[ggerganov]

Another tool similar to this is https://dot-to-ascii.ggerganov.com

[IYasha]

WOw! At least this one works. Thanks! But it's not for mouse drawing, more like scripting.

[brooksbp]

Wow, this is awesome. Definitely will speed up creating such drawings. Thank you!