Add a rolling 6 month and 1 year view to those metrics without it (e.g. HRV), 4 weeks is really not long enough to see any meaningful change.
Use daily data as the base and add weekly moving average for longer term data.
For HRV, rather than colour the data point to show you are in or out of range, add three bands of colour green, amber, red, and simply have black data points for daily, then a 7 moving average for the line.
If Garmin is not willing to make decent changes to connect dashboards, please add a daily times series CSV data export button for all health metrics stored so we can create our own dashboards.