Blue filter a.k.a night mode reading

Well I love this apps more than the other.
I'd been comparing many manga reader on linux and the winner is yacreader, for me though.
By the way, is it possible to add night reading mode, or to be precises blue light filter feture to yacreader?
Well I often do bulk reading manga, so once I started reading all of my batched series, I'd take hours to finish all of them, and I often hurt my eyes.
Som, it would be great if yacreade had a built-in blue filter (night reading) feature rather than depends onto
external tools.

Thank you, and keep the good work.

That's probably doable, but what is the issue with using external tools? I'm using redshift on Linux and it works perfectly for me.