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.

Comienza reproduciendo el problema con traces que tengan nombres muy largos y revisa la discusión de la comunidad enlazada sobre el comportamiento solicitado de la leyenda. Aclara qué opciones de desbordamiento deben admitirse y, después, verifica que el gráfico siga siendo legible con etiquetas largas y que el comportamiento seleccionado sea visible para los usuarios.