Customize Garmin cycling coach program and sync to Tacx

Hi;

The following issue i have faced when i got my indoor traning setup completed. I have created a Garmin coach plan to get in shape for a race in april, but due it is a MTB race i wish to customizre little.
According to the desciptions of the foirums and Garmin webage, cycling coach is more for road cyclings, and missing the HIIT and brush workouts used for cross county riding, but i wish to use the adaptive function. That is the reason i wish to edit the workouts.

When i open the calendar in Garmin connect, i can not move the pre-scheduled workouts / can not removed neither. If i add a custom one, that is all right to edit or schedule.
I-s there any possible way to customize these workouts(from coach plan) in my calendar?

The other issue is these workouts does not apperas in Tacx app (neither in Desktop or mobile). If i add any workout created by me is syncronized. 
-Is there any solutions to get coach plan into Tacx app? 

Available utins to maximuze Garmins ecosystem usage:
Tacx NEO2T 
EPIX gen2  Sappire
Edge1040
Rally XC200

Thanks in advance