Is it possible to make shortcuts to special characters like ë for example in Fedora?

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Fedora and Gnome have excellent built in support for typing in many foreign languages. However it is inconvenient to change an entire input method for example, just to enter a special character like ë. These special characters are found at the gnome special characters application which has many useful characters. However I am finding difficulty finding a way to create a shortcut to any of them like there are in Windows. Is anybody familiar with this or knows a way how to do this? Thanks in advance.