How to fade out dialogue text?

[Hellboy]

I'm convinced this is basic stuff, but I cant find out how to fade out a character's text with the dissolve transition.
I wanted something like the "text" option, but I defined a "narrator" because I wanted an outline and stuff. So this is what I have:

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narrator "I dissolve in, but I don't know how to dissolve out" with Dissolve(2.0)

What would be the equivalent of this for a character's text?:

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show text "I can dissolve out" with Dissolve(3.0)
hide text with Dissolve(3.0)

Thanks.

[PyTom]

There isn't a terribly good way to do this in modern Ren'Py. You'd have to do something like:

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$ extend("", interact=False)
with None
with dissolve