Thats true, its not considered as free luggage,
You have to get it shipped either through some cargo service like Singapore cargo for AirCargo or else u have to check with Qatar Aviation for the requirements to send this to India. Once it reaches India, you have to show the invoice and all the docs to them in customs clearance office in India and they will charge you the Customs duty and since its personal effect then i hope no legalization on the item.

I don't remember abt the percentage of customs duty they will charge,

Hope this details helps u