Export Trash Folder

Hello together
I just bought a new phone and exported settings on my old phone to import on the new one.
Now, all my mails are on the new phone, but my trash folder is empty.
Is there any possibility to export my trash folder to the new phone? Sometimes it happened that I needed some information of an old mail, so it’s very important for me to have all my trash mails on the new phone.

Thanks for helping