Are there any mods that add flight boosters to gliders?

[InternetDragon]

like the other block game's elytra rockets

[Professor Dragon]

Not that I know of.

However, there are mods that improve the basic glider. Search the net for "vintage story glider mod" and you'll come across them.
eg https://mods.vintagestory.at/show/mod/21867

Or there are mods which improve air travel in totality, from simple hovering cars to a full on air-ship:  https://mods.vintagestory.at/vsairshipmod

Professor Dragon.