The notify ‘to email field = table field all rows’ does not yet support this.
but set up a (hidden) text field (set the character limit accordingly) and then on the table object ‘row looses focus’ run a set field script to write to this text field..
Table email field – current Row
value of text field
the text field will then contain all the email addresses in the format of email@example.com;firstname.lastname@example.org;email@example.com etc .. and then setting the notify action to this text field will ensure all these email addresses are notified