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Upload and show HTML Designs

Hi everyone,
I need the ability to edit text on images / designs. Currently my solution is to upload HTML designs. Such HTML designs can be exported from Adobe InDesign etc. without any problems.

In the HTML designs are also merge tags (variables in text) available, which I want to map afterwards with variable data.

Can you tell me how or if I can upload HTML designs? Similar to a PNG or PDF.
The user should make an upload, then the uploaded design is displayed and the merge tags in the design are read and can be mapped by the user.

Thanks!