Hi!
When we used a taxi from the port terminal, we got help from the staff there to tell the driver where wanted to go, and to be on the safe side, we had already put in googletranslate the sentence to say where we wanted to go to. And showed the taxi driver. It worked no problem.
We used uber a lot in Tokyo (but they are often just normal taxis, registered on the website), but this was not an option in Kochi for example.
Some taxi driver use google translate to "talk" to you, meaning they speak in their phone, googletranslate does it's job, and he shows you the written translation in English...