Allow style editing of graph legend labels

Thanks so much for your interest in Dash!

The feature has already been tangentially discussed here: https://community.plotly.com/t/scatter-plot-how-to-wrap-legends-text-when-legend-text-is-too-long/4767/7

Is your feature request related to a problem? Please describe.
I have traces that have very long names. It's problematic because the legend text does not word wrap and so it squishes the graph.
Here's an example: https://postimg.cc/VSq0bQXW

Describe the solution you'd like
Please allow for more stylistic control over legend text, particularly allowing for textoverflow control, like word wrap, hidden+ellipsis, hover tooltip etc.

Describe alternatives you've considered
I had to resorted to displaying a hashmap to translate the long text into a shorter signature.

Additional context
I've had it where the text is really long that the actual graph is completely unreadable.

Beginne damit, das Problem mit Traces zu reproduzieren, die sehr lange Namen haben, und prüfe die verlinkte Community-Diskussion zum gewünschten Verhalten der Legende. Kläre, welche Überlaufoptionen unterstützt werden sollen, und überprüfe anschließend, dass der Graph mit langen Beschriftungen lesbar bleibt und das ausgewählte Verhalten für Benutzer sichtbar ist.