You can create blood pressure measurement reports in the Garmin Connect app and Garmin Connect web. Select a platform below for instructions.
Open the Garmin Connect app.
Access the menu by selecting More (bottom right).
Select Health Stats.
Select Blood Pressure.
Select a timeframe at the top (1d, 7d, 4w, 1y).
Select 
(top right).
Select Export PDF Report.
The report will generate a PDF which you can share with anyone. Touch the share icon on your phone to send the PDF report.
Sign in to Garmin Connect from a personal computer.
Select Health Stats from the side panel.
Select Blood Pressure.
Select a timeframe in the upper right.
Select Export
.
Select Download PDF Report.
Blood pressure measurements can also be exported to CSV using the instructions above. Once the report is downloaded you can attach it to an email to share it.