Can't write anywhere instead of using keyboard ?

Wish I could write anywhere with the S-Pen and have it transcribed to text.

I tried it here on Chrome on my Note 5 right now. Pulled the S-Pen out, went to handwrite in this reply box, but nothing happens.

I then opened Google Messenger, tried writing and a little Blue circle with a T popped up, and yes, I could handwrite a message, and then it transcribed it, and I sent it. Sweet that's exactly what I wanted, and thought I could do that in web browsers too ? Or e-mails ?

So can only certain apps allow you to handwrite instead of typing ? I thought with a Note phone, anywhere that could use the keyboard, that you'd also have the option to use the S-Pen and could handwrite if wanted ?

I do have Direct pen input on in the S Pen settings.