The originpro package is build on top of another package that is more of an underlying API type package.
originpro does not have the ability to execute LabTalk statements but the underlying API does.
This statement provides access to the underlying API to allow LabTalk to be called.
op.po.LT_execute('some labtalk statement')
We are reorganizing our docs in this area currently. So it is sort of "insider knowledge". We can mention this sort of thing when we release the docs closer to release of Origin 2021.
Thanks,
Chris Drozdowski
Originlab Technical Support