Is this ok?? Just bloody umbilical cord??
Anything to do here?
The navel isn't fully closed, my recommendation is the same as mentioned earlier. Try to keep the brooder clean to reduce chances of infection. Dab some chlorhexidine or antibiotic ointment without pain reliever onto the navel about once daily and hope for the best.

How is the rest of the hatch going? Did the rest finish hatching?