Can my fiancée provide a self-declaration as a valid NOC?

I am from Andhra Pradesh, currently residing and working in Taiwan. My fiancée is a Taiwanese citizen, and we plan to register our court marriage in Delhi, India, under the Hindu Marriage Act. We are preparing the required documents for marriage registration in India but are unsure about obtaining the No Objection Certificate (NOC) for my fiancée. She is not employed by any institution. We contacted the Taiwan Household Registration Office and MOFA, but they have no experience issuing NOCs for marriage registration in other countries. Can my fiancée provide a self-declaration letter stating that she has no objections to the marriage, and would this be considered a valid NOC? Alternatively, does she need to prepare an affidavit, have it notarized, and get it verified by the Indian Embassy in Taiwan? Please guide us on what can be considered a valid NOC in this case.