Store LUKS key in the TPM for passwordless boot?

I know this is possible in a systemd distro, but I can't find any guides on how to do this in Slackware. Basically right now my laptop I have a Windows 10 ssd with bitlocker enabled and the other ssd is running Slackware 15.0 with LUKS. Right now I have to enter the password to open grub, then enter the password to unencrypt the root partition. I am using a key to unencrypt the swap partition so I don't have to enter the password a third time. But I am wondering if anyone has a setup where the key is stored in the TPM for a passwordless boot?

Second, I know I am going to get some replies about the security implications of this or saying its a bad idea. I am fully aware of all the risks I just want to know if it is possible in Slackware with Grub.

Thanks.