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Your code just set item P123_DISPLAY_HTML value to session state.
It do not call any on demand process that could return something.
Below code do not do anything else than trigger custom event in APEX 3.x. There is nothing out of box that bind to that event.
Maybe this old Carl's blog post help you to right direction
Thank you Jari, I will look into Carl's blog. If you or anyone as some other direction, please let me know.