code: @Override
    protected PyExpr visitCallDelegateNode(CallDelegateNode node) {
      ExprRootNode variantSoyExpr = node.getDelCalleeVariantExpr();
      PyExpr variantPyExpr;
      if (variantSoyExpr == null) {
        // Case 1: Delegate call with empty variant.
        variantPyExpr = new PyStringExpr("''");
      } else {
        // Case 2: Delegate call with variant expression.
        TranslateToPyExprVisitor translator =
            new TranslateToPyExprVisitor(localVarStack, pluginValueFactory, errorReporter);
        variantPyExpr = translator.exec(variantSoyExpr);
      }
      String calleeExprText =
          new PyFunctionExprBuilder("runtime.get_delegate_fn")
              .addArg(node.getDelCalleeName())
              .addArg(variantPyExpr)
              .addArg(node.allowEmptyDefault())
              .build();
  
      String callExprText = calleeExprText + "(" + genObjToPass(node) + ", ijData)";
      return escapeCall(callExprText, node.getEscapingDirectives());
    }
docs: Visits a delegate call node and builds the call expression to retrieve the function and execute
  it. The get_delegate_fn returns the function directly, so its output can be called directly.
  
  @param node The delegate call node.
  @return The call Python expression.