How to create pie based timers

I’m trying to create a timer that expires using synfig. I need it be a pie based timer. I thought of achieving this locking a pie’s vertex handles to a circle outline

But looks like its not that simple

Can someone suggest a way to achieve this

Thanks

Looks like this thread addresses my requirement

synfig.org/forums/viewtopic.php?t=4591

Thanks a lot

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For those who might lookup the thread, here is the version of timer I created based on previous thread