Yes, in Magento 2 it is possible to define multiple countries at once when setting up table rates for shipping.
In the "Condition" section of the Shipping Table Rates configuration, you can choose "Shipping Country" as the condition, and then select "is one of" as the operator. This will allow you to enter multiple countries at once, separated by commas.
Then, in the "Actions" section, you can define the shipping rates for those countries.
So, in your example, you would enter "IRL,FRA,FIN" in the "Value" field for the "Shipping Country" condition, and then define the corresponding shipping rates for those countries in the "Actions" section.