Imported activities with no TL

Hi All -

Currently the only activity that doesn't sync to my Coros are my indoor training bike rides. I record them on Zwift and then import the .fit file to Coros. The ride and all of its metrics (time, average power, normalized power, etc.) all show there but there is no training load. I'd love for Coros to show my overall training load but right now it's missing 3.5h worth of cycling... and gets much more skewed when I'm out of off season.
Any ideas?

Thanks!