You can't schedule a label (or any annotation elements).
You will have to schedule the element (window?) the label is attached to.
The label gets its information from that element anyway.
If you are manipulating the information from the window in the label script itself, then you will need to do the same in the window script.
Or maybe you can do it with expressions in properties - that way you don't have to touch the window scripts.
You can then schedule the resulting properties.
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