At the moment, we do not have a way to deal with indoor/outdoor power discrepancies. We do, however, have an open feature request that you can support here:
As a workaround, you can set your TR FTP as the FTP you use outdoors, and then turn the intensity down on the indoor workouts as @timon suggested. Once you complete the workout, you can manually change the FTP for that specific workout to your “indoor FTP.” This will correct your TSS for your indoor workouts. To change your FTP for once specific workout, select the completed workout and click the Edit button. Then, change your FTP to the FTP you use indoors, and click “Save”.
