@Override
    public <T> T accept(ExpressionVisitor<T> visitor) {
        return visitor.visitMultiSelectHash(this);
    }
Creates an object using key-value pairs.

@see <a href="https://jmespath.org/specification.html#multiselect-hash">MultiSelect Hash</a>
smithy-jmespath/src/main/java/software/amazon/smithy/jmespath/ast/MultiSelectHashExpression.java