Use Y axis value to define time span on X axis?

Hi all,

i am currently trying to build a health dashboard with Grafana, based on data from Apple Health.
So far so good, quite an easy experience even though i have never used Grafana before.
My only Problem by now is, that i only get the workout duration as a single value. Therefore i can not display the workout duration as a line graph and need to utilize now the points style, as shown in the picture, the orange dot.

Is there way to extract the value of the workout duration, in this example 36 minutes and use the duration to define the length of the line graph on X axis?

Any help welcome