Glissandi for chords?

About glissandi, it is worth remembering that the plucked instruments with a fingerboard (especially the guitar) can use the glissandi on several strings.

For example, the famous study No. 12 by Heitor Villa-Lobos.
See this attachment:

and possibly the followed video: it is sufficiently instructive! https://www.youtube.com/watch?v=2rdvKtdYoso

Unfortunately, for now, it is possible to add glissandi only in the context of a single melodic line. But not in the context of two notes, or a "Power Chord" (A5, D5, etc), or a chord with three or four notes etc. Or I missed something?

I tried it with the beginning of this study 12. I can do everything, except add these glissandi on the two notes below the first one :(

And the file mscz. for testing : glissandi chords.mscz

I can to go to the Lines palette and add lines straight lines one after the other, and after having made the right length, and drag and drop to the right place ...

But I give up! The score is 6 pages including 4 with glissandi!