Any way to add arrow / stroke / direction to LineStrings in TimestampedGeoJson plugin?

[mberat]

Is there a way to add directions or arrow on the lines created by the LineStrings in the TimestampedGeoJson? The PolylineDecorator seems to be doing something similar but I don't think it works for my purposes as I need to add it to the TimestampedGeoJson, i.e., it needs to be dynamic.