How can I set a feature reference expression?

Syside How-to Guides
8

This requires FeatureChainExpression:

_, chain = seq_expr.arguments.append(syside.FeatureChainExpression)
_, lhs = chain.arguments.append(syside.FeatureReferenceExpression)
lhs.referent_member.set_member_element(part1)
_, rhs = chain.target_feature_member.set_member_element(attribute1)
Creating a feature chain expression for an action performance