Adding a word with an apostrophe

Hi to all, I need to add the common italian word - po' - to the personal dictionary. In my pad device, a Huawei P8 Lite 2017, the installed version of SwiftKey has been working properly. In my current device, a Xiaomi Redmi Note 8, it doesn't. I have the same SwiftKey account. That word is really important because it has a really common use in the Italian language. How can I add that word to my dictionary? Thanks.