Follow the steps below to Create a Custom Field with Default Text

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First Create Custom Field:
Go to Projects>Go to Project Settings >Click on Fields > Click on Action (Top-Right side) > click on Edit Field> Custom Field (Bottom-Left side) > Now you are in Custom Fields JIRA admin.
Now to create a custom field, click on Add Custom Field (Top-Right side) > Choose a Custom Field > Click on ‘Next’ button>Enter the Name and Description > Click on ‘Create’ button – Select Boards to give them access(From List) > Click on ‘Update’ button.
To Add Default Value to the Custom Field:
Click on three dots (in front of custom field) > Click on Configure > Click on Edit default value >Put text in the Custom field> click on the ‘Set Default’ button.