Mail Merge: Need Transparent Background for Signatures

I'm using ZohoCRM and Zoho sign to send documents to customers to sign. We use zohoCRM's "Mail merge" option to create the templates.

The problem is that those "Signature" fields have a solid white background so it looks like a stamp on the page instead of a nice signature on a line. I'd like the signature to have a TRANSPARENT background so that you can see the signature line behind it,

If I use the Zoho Sign website to create the template, instead of the mail merge option, it works the way I want it. I'm trying to determine how to get this to work with the Mail merge option.

Does anyone know how to make the mail merge signature image transparent when signing?

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