Thank you so much for your help on this.
I tried the sketch you provided. The header file driver/temp_sensor.h is there and the sketch compiles, but the sketch causes a core dump.
I’ve not gone with the external sensor so far because I’m trying to squeeze as much as I can out of a button cell. Maybe I’ll just use an external sensor to calibrate better the internal sensor. That may be a way forward for me while I wait for proper support to be added.
Thanks again and Happy New Year.