Yes, it is possible to use escort services in Japan even if you are not Japanese. However, it is important to note that many sex businesses related to prostitution voluntarily ban entry to foreigners, including tourists[2]. Some escort services in Japan may not provide services to foreigners, but there are foreigner-friendly escort agencies in Tokyo[4][6]. It is also important to note that Japanese is not required to use escort services, but knowing a bit of the language can help the companions who are still learning the English language[4].
Citations:
[1] https://tokyoadultguide.com/threads/do-escorts-only-do-sexual-stuff.17017/
[2] https://en.wikipedia.org/wiki/Prostitution_in_Japan
[3] https://www.reddit.com/r/japan/comments/1vb5y4/i_spent_a_few_thousand_dollars_on_hostesses_and/
[4] https://paradise-tokyo.net/faq
[5] https://en.wikipedia.org/wiki/Types_of_prostitution_in_modern_Japan
[6] https://www.japanholiday.com/tokyo-travel-guide/red-light-district.html
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