Hi Keith,
I am not aware of some ready-to-use API in Web Dynpro ABAP to achieve this. The fact that I don't know of one doesn't mean one is not out there - maybe you'll find something or one of the community members will and it will be shared here (or linked to it).
That being said, I can think of a work around that might help you. If you take a look at the solution here, I can advise you to implement it in your app by integrating an HTML island (some help you might need) and following the solution from there.
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