Can we change default confirm box input type text to textarea?

Questions
1

can we change default confirm box input type text to textarea?

2

Do you mean for prompt dialog https://framework7.io/docs/dialog.html#prompt?
No, it is not supported. You need to create custom dialog with app.dialog.create and passing required parameters https://framework7.io/docs/dialog.html#dialog-parameters. You can use for reference default prompt source code https://github.com/framework7io/framework7/blob/master/src/core/components/dialog/dialog.js#L56-L85