many times, spiritual energy, life force and energies in general are called chakra.
but kaguya has been using tsukuyomi before hagoromo and asura spread chakra/ninshu
anyway look at the scans below
This is from shikamaru novel
NOW SCANS FROM THE NARUTO MANGA
i mean this was mentioned several times in the manga
1.
this is Pa
2.
this was the earliest explanation of how chakra is created.
I will like to look for scans of Neji looking at spider guy before and during him performing a ninjutsu, it was clearly shown that chakra moves through certain pathways from the heart to whatever part of the body.
like i said you need to learn how to knead chakra(mix physical and spiritual energy together) to create chakra something ninjas are taught. I mean even there was a time tobirama as a kid said he could not sense what hashirama was sensing cause he was not kneading chakra then e.t.c.
Anyway this are the scans i went to find, if i had more time i would have tried to find more especially the two i mentioned up there