In the contract proforma enclosed by you above, there is mention of "Consolidated (compensation)" (para 3). However, there is no reference relating to benefits under the Maternity Benefit Act, 1961. In this connection, I am enclosing copies of a judgment of the High Court, which I believe will be relevant in your case. You can also download other judgments mentioned in this judgment and study the same.
Further, ECHS organization has been established for over 10 years. During this time, there may have been cases of female employees on a contract basis who have claimed maternity benefits. In my opinion, you can inquire from other units of ECHS offices.
However, I would like to point out that in India, the compliance position of labor laws is very poor. The State itself discriminates in providing social security benefits to its female employees. Additionally, you can make further inquiries or obtain information through RTI, etc., and can also file a grievance through the proper channel if allowed as per the terms and conditions of your employment.
Regards