exactly thats the juicy part of the engine that no country that can builds engines will share. heck if its that easy the chinese would have had jet engine ages ago. mind you they are around the corner. also its not only heat damage and the metalic compound. but the design of the combustion chambers so that they burn efficiently. we have the layout of the compresser fans and the discharge fans.
personally i say go for the m88 for the amca and build as much as you can out of it.
i find it weird that india can think it can buy the tech for an entire engine. look at japan
they started with the f3 which had plenty of problems. the program started in the late 70's lets say 78
it entered service in 1985 (note that it has no afterburner) it had problems and accidents and 5 years later it was good then a revamped version came out in 1999.
an older variant of the f3
and the ihi f3-30
with an afterburner
and the ihi xf5 to go on the x-2 5th gen fighter
now that im bringin this up its quiet clear india is trying to sprint whilst still on all 4's the japanese have done it by the book. a small (15kn-25kn) non afterburning jet engine follwed by an upgraded engine and then and afterburning engine and then make bigger engines.