So, a while back I started trying to create shortcuts that would open the terminal, and automatically cd to my bookmarked directories. I tried a few ways without much success, but this is how I ended up managing it.

So, the file that stores the bookmarks is

~/.config/gtk-3.0/bookmarks

And it lists, in order, every directory I have bookmarked. My objective is to have shortcuts such that ctrl 1 opens the first bookmark, ctrl 2 the second one, ctrl 3 the third, etc. So the first thing to do is creating a script, I will call it "bookmark", with the following code:

u="$(sed "$1q;d" '/home/joaquin/.config/gtk-3.0/bookmarks')"; 
gnome-terminal --working-directory="${u:7}";

The first line sets a variable "u" equal to the Nth line of the file. To get "N", we read $1, the first argument passed to the command call. The second line, calls gnome-terminal with that starting directory, slicing the first seven characters because they aren't of use here.

Next, I go to settings > keyboard shortcuts, and create a shortcut for ctrl 1 with the following code (replace the path with the path to the script created)

/home/username/Scripts/bookmark 1

and for ctrl 2

/home/username/Scripts/bookmark 2

that last number will be passed as the argument for the script, and the script will open a terminal in the correct directory.

Hope this helps someone.