In order for India to produce such aircrafts and engines, India must start investing in its manufacturing structures and R&D. To achieve it, it is not an overnight task. It takes years and years of small steps.
Let's say, an India aero sector, be it government or private has come up with a workable engine design, does India has the knowhow to ,say, make a ballbearing for that engine that can withstand high revs, high heat that does not dry up or seize up, or leak. To make such a ball bearing, you need precision tools, manufacturing process and machinists. Let's say you have all those, do you have the metallurgical knowhow to produce such metal for the ball bearing and lubricants for that ball bearing.
This just one simple component. So even though India can make that engine, it still needs to source all these basic components from foreign countries if India cannot make these components in house.
I don't mean to say India must make every single parts itself.
India must be willing to spend money, time, training to achieve such goals. It is a long term process.
All the Best