Yes, I had to ask because cntrl+f call within reference or anywhere leads to nowhere, and @Joan_Rake1 has call() within fx_layer_cake_2.
¢all() in the math parser has been renamed run() in 2.9.0, so there must be something to fix if call() is still used somewhere. Will check that.
Basically, run() is able to run a G’MIC pipeline, from the math evaluator.