In theory it might be considered possible, but in practice, probably not. First of all, one would need to clearly define all of discrete components of "human milk" (which is a VERY complex mixture of diverse components) and locate and clone ALL of the genes that go into making "human milk"- including all of the genes for the various structural proteins, enzymes, hormones, fatty acids, cofactors, etc. It is a relatively straightforward (but still very difficult) task to take a gene from one organism and insert into another where it can be expressed. For example, we can make a goat that secrets tissue plasminogen activator (the gene of which was taken from another organism) in its milk, but that is just one gene. HOWEVER, how one would gather ALL of the genes to make "human milk" from their assorted, various locations, clone them into a rabbit so they will be expressed in the rabbit's mammary glands......THAT is the stuff of a scifi movie.