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Map chart : gradient option for lines in Line Layer

Hello, I'm new to Qlik Sense and I'm not sure what can be achieved with all the visualisation tools.

I'm trying to show trade flows on a map, and used a Map Chart with a Line Layer. Looks nice, but it is impossible to have an idea of the direction of the flows for several reasons  :

- too many lines : the arrows are lost in the fray

- some flows have huge arrows (the arrow from China to Honk Kong covers half of Russia)

All would be solved if we could gradient-color the lines. It should be possible, since all the lines have a clear 'to' and 'from' point, the place where we chose to place the arrow could be replaced with the tipping point between two colors.

What would it take to achieve that? Thanks I advance.