unlikely to happen

This brings up the bigger question of "what do you do with blending in a single track timeline?
Unless you're only interested in blending an image with itself, the everyday use of blending modes is with more than 1 layer of content. And resolve does one layer.

I suppose you could bring them into an EDL as a clip with a 100% duration dissolve, and then have Davinci treat it as a constant dissolve effect, but not sure even then how that would work.