Question: Possible to use field for client mail adresse

Hi,
My form contains the entry of several email addresses (family membership to a walking club)
The email is sent to the person who entered the form, a priori, to the last recognized email address (default mode on settings sending customer email)
So I want to use a custom "client' address".
I don't see the possibility of putting a field containing an email address.
If I write a field ([fieldid= xxx] by hand, will it be taken into account?
thank you for quickly answering me
My form must be in line at the end of this year
Claude

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