Inserting a generated PNG file into a "HTML Doc From Template" node

Hello,  I have an ask to insert a generated PNG file into an HTML document we generate through the "HTML Doc From Template".  This document is then later converted to PDF which is given to the user.

The image generation and PDF generating is working fine, however I cannot get the image to appear in the template.  I've found many older forum posts saying to convert the image to Base64, but it appears the functionality to generate the base64 within a process model has been removed from Appian.  I cannot pre-generate the Base64 as the image itself is generated on the fly and then deleted within the same process.

Any ideas? Thank you!

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