Maybe a cannula would be attached at a certain point? I think the real difficulty would be producing nutrients and mixing them into the blood. I am clearly a nonexpert.
I brought this up thinking about the broader "chicken and egg" ethics & scaling problem of tissue growth. Currently the biotissue alternative meats are dependent on fetal bovine serum to get started. A vegan might object to these meats.
I don't personally support these methods, and am just spitballing ideas on the tech side of the aforementioned problem.