Description

Hello,
I am attempting to use asm parameters with the SendGrid API Transport.
The asm parameters need to be sent like this

{"subject":"Hello, World!","asm":{"group_id":1234,"groups_to_display":[1234,5789]}

However, with the mailer, I am only able to add parameters in the headers or at the 'personalizations' => 'custom_args' level.

Have I missed something?
Is there a way to add parameters at the root payload?
If not, could this feature be added?

Thanks.

Example

No response