[1.12.2] Raytracing Fire Blocks

Hi again, i've been posting quite frequently on here now hehe, it's just that i'm trying out so many new things and have no idea which methods do which in some of these cases. So i'd like some information on how this would be done. I have my item set up, a bottle that fills with fire whenever a block of my choosing is right-clicked. However, i can't seem to get any fire-blocks from raytracing, and the case seems to be that fire-blocks has no hitbox, and so, i would like to know how i can go around this issue. I have tried looking into waterliquid to see how it distinguishes fires, however i did not find anything there, i then also tried looking into how the player can extinguish fires by left-clicking on top of the block that is burning to no avail. So i'd like some info on this issue. ^^