Support for customising legend labels.

[legendarydrew]

Is your feature request related to a problem? Please describe.
There is no ability to customise the appearance of a chart legend's labels, as there is no corresponding property in PSC.Blazor.Components.Chartjs.Models.Common.Legend.

Describe the solution you'd like
I would like the ability to customise a chart's legend labels, through the Legend plugin. (e.g. to display circles instead of boxes for datasets.) It is not possible to do this, as far as I can tell, with the current release.

Describe alternatives you've considered
none

Additional context
https://www.chartjs.org/docs/3.9.1/configuration/legend.html#legend-label-configuration