Update: the InDesign team has announced Hybrid Plugins are coming soon, however at the moment there are no plans for C++ to UXP communication or C++ functions embedded in UXP Hybrid Plugins. I made a new issue specifically on this item here:
Update: the InDesign team has announced Hybrid Plugins are coming soon, however at the moment there are no plans for C++ to UXP communication or C++ functions embedded in UXP Hybrid Plugins. I made a new issue specifically on this item here: