So "The Client" in the Mandalorian says that Grogu is and "asset". And Doctor Pershing tries to experiment on Grogu. And when Din tries to save Grogu from his cell Moff Gideon is there and he says, "All I wanted was some of his blood." I think that The Client, Doctor Pershing, and Moff Gideon are all followers of the Empire and they want to rebuild it. They need Grogu's blood to clone Palpatine. They need to use the midichlorians in Grogu's blood to give to Palpatine's clone so he can use the Force. So it would make sense why they want Grogu so badly and why Moff Gideon tests Grogu in Chapter 14.