Add linear 4 color gradient somehow?

Hi,

is it possible to somehow, through scripting, add a 4-color-gradient effect to a layer that uses linear gradients? I can add the 4-color-gradient effect, however that one uses circular gradients between points, which is not what I need.

The manual options I have found so far are:

Shape Layer with Gradient fill

Ramp with Colorama

Layer Style with Gradient fill

However, neither of those options can be controlled though scripting, it seems.

Any chance there's a workaround somehow, somewhere?

Cheers