Here's what I have been doing.
Load the clip you want to color correct/grade into speedgrade. After you have the desired look you want, hit ctrl+p (mac: Cmd+p) to save the look.
Then right-click on the new preset look you just made and select "Export Look" a menu will pop up. Select "Export". Save the zip file somewhere on you PC
open the zip file and extract the .Look or .cube file from the zip.
Open up Premeire, load a project. Add the "Lumetri" to the desire clip. Lumetri will ask you to find a LUT to add to the clip. Go to the extracted .look or .cube you made from
speedgrade and now you're done.
I hope this helps