Need to change the ‘Subject’ line of the emails

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The email that is sent to Admin when Customer requests a Shipping quote is “A new shipping quote available – [Customer]
We need to change it to:
New Shipping Quote REQUESTED – [Customer]
– as this wording is more a ‘call to action’ ( in the 100s of emails that admin receive each day ;).

We have modified the body of emails – by copying them to our child theme and making the mods there.
But the only reference we have found to changing the subject line is here:
https://stackoverflow.com/questions/51214789/customizing-email-subject-with-dynamic-data-in-woocommerce

But this does not cover Freight Shipping Quote’s emails.

If possible, we would also like to set the email priority to ‘High’:
This page may hold the info.:
https://coderomeos.org/php-mail-function-for-urgent-and-high-priority
re:

"X-Priority: 1\n". //headers for priority
"Priority: Urgent\n". //headers for priority
"Importance: high"; //set importance

but we do not know where to include this in the hook.

 

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