Customize wordpress plugin

Please check the below requirements carefully. I am trying to embed an online product design software in my website where clients can design their own product(banners) or choose from few templates already provided by the plugin. However, I want to upload my own SVG designs into the templates store of that online designing software. My SVG designs contains images, shapes and text created in illustrator. The current version of the designer software does not allow client to make any changes to the SVG template uploaded by admin as every time the svg is uploaded it takes it as a single image without layers and hence it won't allow clients to directly edit text in the svg. I want my clients to modify the text directly from the custom SVG templates uploaded by the admin, while they are making the design. Please see attached file as a reference.