Yes, this is possible BUT currently not configurable through the UI. You will need to modify the "IsoConfig.xml" file as follows -
Locate the <ComponentScheme ...> section as follows -
<Themes>
<Theme Name="Default">
...
<Annotations ...>
...
<AnnotationSchemes>
...
<ComponentScheme ...>
<ComponentScheme ...>
Add a new component scheme by copy-pasting the following line -
<ComponentScheme Name="CutbackAngle" AnnotationStyle="Standard" Format="{0}°" Enabled="true" Grouping="true" Alignment="FlatHorizontal" LeaderStyle="Always" Filter="CutbackElbow" Fields="ANGLE" />
If you wish to stop displaying pipe bends/elbows, just change value of the Enabled attribute above from "true" to "false". If you want some text to be displayed along with the angle value, add it to the Format attribute above.
Now, locate the <Filters> section (at the end of IsoConfig.xml) and add a new filter for elbows/pipe bends by copy-pasting the following line -
<Filter Name="CutbackElbow" Value="(Type = 'Elbow' OR Type='Bend') AND NOT ANGLE IS NULL AND [ANGLE] <> 9000 AND [ANGLE] <> 18000" />
Upon iso regeneration, pipe bends/elbows will be annotated EXCEPT if the angle is 0, 90 or 180 deg (obvious and more common values which will add to the clutter). Also, the angle value will be displayed in hundreds e.g. 85 deg will be displayed as 8500 ° on the drawing.