第六波のピークは2月末だと感染症の専門家が言ってたと英語で言いたいのですが、
According to some experts in infectious disease, the 6th wave of covid-19 will peak out in two weeks in Japan.
で通じますか。
"According to some infectious disease experts, the 6th wave of covid-19 in Japan will peak in two weeks."
Maggieさんの文は通じまっと自然な言い方になるために少し変わります。
- "According to some infectious disease experts, the 6th wave of covid-19 in Japan will peak in two weeks."
"experts in infectious disease" => "infectious disease experts” 両方は正しですが二つ目の方が自然ないい方です。
"the 6th wave of covid-19 in Japan." "in japan" を "covid 19" の直後に移動させてもっとスムーズな言い方になります。
"will peak out" => "will peak" "out"は言わなくていいです。