A contract, rule, or device shall not operate to relieve the employer, in whole or in part, from any liability created by this chapter except as provided in this chapter . This section does not create a private cause of action. [S13, §2477-m7; C24, 27, 31, 35, 39, § 1378; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §85.18 ] 2017 Acts, ch 23, §2, 24 ; 2023 Acts, ch 66, §13