§ 68-a. Statements of nature and extent of interests to be filed upon request. Whenever any person or corporation signs or certifies any estimate, appraisal, report, or other statement, to be submitted to the public service commission in relation to any public utility company, in which such person or corporation is or has been financially interested, directly or indirectly, or is or has been employed in any manner or capacity, or of which such person is or has been an officer or employee, the commission in its discretion, may require that such signature or certification shall be accompanied by a specific statement setting forth the nature and extent of such interest or engagement.