ilamathi Yes, per the rules, you can have your gender marker changed to Male/Female, you need to submit a certificate from the Medical Superintendent or Chief Medical Officer of the "medical institution" in which you have undergone the said medical intervention - this would be a signed letter from your doctor/hospital stating that you have been "undergoing hormonal therapy since 2019 under Dr. XYZ's care, which is a medical intervention towards a gender affirming procedure as male/female"
You can get it changed to "transgender" without any proof/certificate
See https://lgbtqindia.fandom.com/wiki/Legal_Name_and_Gender_Change_in_India
The rules state that the Transgender ID card they give will be the basis for changing legal name, photograph and gender on all of these documents including educational certificates, as listed in Annexure-I
S No Name of the official document
(1) Birth certificate
(2) Caste/ Tribe certificate
(3) Any education certificate issued by a school, board, college, university or any such academic institution
(4) Election Photo Identity Card
(5) Aadhaar Card
(6) Permanent Account Number (PAN)
(7) Driving Licence
(8) BPL ration card
(9) Post Office bank/ Bank Pass book with photo
(10) Pass port
(11) Kisan Pass book
(12) Marriage certificate
(13) Electricity / water/ gas connection paper
(14) property papers,
(15) vehicle registration
(16) service book, employment papers
(17) identity card related to bar,
(18) policy papers
