(As of March 17th, 2023)
You can receive electronic COE via email when you process COE Application online.
You can apply for entry visa with this electronic COE (with the hardcopy) at the Japan Embassy or Consulate-General in your resident country.
For further details, jump to the following webpage of the Immigration Office;
Electronic COE is available >> https://www.moj.go.jp/isa/applications/procedures/10_00136.html?hl=en