Umbrel with pre-existing bitcoin core node

I have had a full bitcoin core node running for quite a while. Is it possible to get Umbrel to use this full node instead of rebuilding a whole new one? Otherwise, if I want to shut down the pre-existing bitcoin node and copy the blockchain over to Umbrel, how would I go about that? Where would I put the blockchain in Umbrel?

Also, I’ve tried to install the Lightning Core app on Umbrel, and it says that it requires that the bitcoin app has to be installed first. Any way to bypass that and point the remaining apps that need it to the pre-existing bitcoin node?