The old Tacx Training app (TTS, that everybody loved to hate) used to have that mode. It was a bit touchy to use - you had to really ramp the target slowly, otherwise the load would just rise like crazy to make your HR go up. I used it a little back in the days. As far as I can tell, they don’t have that mode in the current-days app anymore. Not sure any cycling app does. As @Gerrie_Delport_ODZ indicated, use a power equivalent, the result will be the same for all intents and purposes.
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