I'm not a lawyer, but as far as I'm aware in all countries that has signed the Berne Convention, you automatically get copyright on everything you create (with some exceptions: companies will own copyright on things their employees create during work hours, generative AIs and animals cannot own copyright to things they create, and violating copyright and trademarks when creating something will void copyright on your custom additions)
So TL;DR: "No, you get the copyright automatically."