There are not any current plans no. If such a project popped up the devs have also voiced that they are not interested in having it merged in to dxvk.
d3d8 was similar enough to d3d9 that it kind off made some sense, but anything before that not as much.
TL;DR no.
Nothing extracted yet.
Directx 8 is supported now but how about any plans for support Directx from 1 to 7?