Weekly trainingszone overview

Dear community,

Since yesterday I started exploring this site and I think it is really awesome. I had one question about the trainingzone overview. When I do a indoor cycling workout (on Zwift) intervals.icu sums up the time in different training zones and also accumulates the time for an entire week.

However, when I do a running session on the track I only time my intervals with an old watch that doesn’t save any data. When I plan the session on intervals.icu and handwrite my interval duration and paces it does mention the time in different training zones.
But, when click that I executed the planned workout the time in different training zones is not added to my weekly total.

So long story short: can anybody help me with adding the trainingtime in different trainingzones with manually added training sessions?