We do not have any PETg profiles for Cura 21.08, but we do have them in the 3.2 branch in the experimental section.
If you would like to use 21.08, nGen profiles will be a great starting point for you. PETg and Amphora print with nearly the same settings from our testing. If you would like to try out the latest cura, you can find details on how to get it set up here: Cura LulzBot Edition version 3.2.11: Alpha Testing