Samsung Keyboard and Gboard (Google Keyboard) both have a Text Shortcuts feature. Users can assign a keyword to detailed text in the settings. When typing, if that keyword is entered, the keyboard app will automatically suggest the related detailed text.
For Samsung Keyboard:
Tap the gear icon to enter Keyboard Settings.
Select Smart Typing.
Activate Predictive Text.
Tap on Text Shortcuts.
Press the Add button.
Type the shortcut keyword in the Shortcut field.
Type the detailed text in the Expanded Phrase field.
While typing, enter the keyword and tap on the text from the suggestion ribbon.
For Gboard, it can be done similarly by navigating to Gear Icon > Dictionary > Personal Dictionary > All Languages or your language.
