Is this graphic design portal useful? Its like a headless CMS but for graphics

Hi All. I am a software developer as well as a freelancer in things like graphic design. I sometimes run into clients needing small changes to text (phone numbers, prices). This led me to try and build a web app where you can upload your final designs but make certain things editable by the client themselves.

The way it works so far (1-day prototype) is you just add tags to your design. eg {{Name}} which the app will pick up on and generate some text boxes. When you enter text into the textbox it will replace the tag with the text.

Here is a basic demo. Any feedback is greatly appreciated:

https://pixelportal.cbapps.co.za/template/rsvp

One with some more tags
https://pixelportal.cbapps.co.za/template/ramadan

Some issues so far:
Only works with SVGs. sometimes SVG exports can be messy and fancy text effect will cause it to be converted into curves