I would advise against putting /home on your hdd. The reason is that there are config files and cache stored in /home. There will a performance hit if you do that.
Instead. Do it this way. Put / on a btrfs partition on you ssd. Create a btrfs partition for you hdd and mount it at /data(or any other name you like).
After the install is complete. Create subvolumes for documents, videos, downloads, pictures, music. Then symlink those into the proper locations. This way your /home is on your ssd but the big files which consume lots of space are on the hdd.
However, if you would prefer to do it the other way, it is easy. Just create a btrfs partition in the installer mounted at / on the ssd and create one on the hdd mounted at /home