Fermata question

Sometimes several short fermatas in one part ought to add up to one normal (or long) fermata in others. Can this be shown in Dorico? In the attached sketch, for example, I would prefere short fermatas in the upper instrument, but the others are interested in knowing that the bar will last for quite a while.
Best regards,

I use a fermata playing technique for the “little” ones that do not propagate to other staves, along with the implemented ones.

Good idea. (Specially since the fermatas does not affect playback for the moment.)