How could I draw a line or polygon with directional symbols (e.g. arrows)?

[MarcoPiccolino1]

We want to show the direction of an MTB track.

Is there any way to achieve this in the symbol without recurring to extra geometries?

[AlexanderNohe1 · Accepted solution]

I do not believe that out-of-the-box there is a line symbol that contains an arrowhead on one end.  There may be a way to do it with custom symbology but I am unsure of that.