I have setup and shared a Training Advice field for the wellness custom metrics as follows:
You can manually set the field in the wellness dialog or you can send a score (1-4) through the API by means of a little vba script in the Excel version. I have something working but need to update the Excel file.
I have the Advice chart (also shared) right below the HRV charts, which allows me to quickly check if both analysis are in line with each other.

