It just feels off to me that only war could bring someone to martyrdom. There’s no way a religion wouldn’t honor those who died putting in effort. I would argue that the idea runs contradictory to pretty much any religion with a central Deity. People wouldn’t put in the effort otherwise.
According to Wikipedia (not definitive but at least this source is universal) the first martyr was a woman who did not die in a war. She was murdered for converting. This page also lists sources for ways to be martyred in nonmilitary efforts.
Here is a thread I found on reddit called Explain To Me Martyrdom that also states not all martyrs die in war.