I have a web joist object that has that option, and many more that are not available with the out-of-the-box joist. It may not look exactly the same, but I have been using it since AC7. It is available on my website:
http://www.archisolutions.com/Store/GDL.html
And I am always open for suggestions on how to improve my GDL creations.
David Larrew, AIA, GDLA, GSRC
Architectural Technology Specialist
a r c h i S O L U T I O N S
WIN7-10/ OSX 10.15.7
AC 5.1-25 USA