How to make the card view preview image keep its transparent background

Currently, each note has its own .webp image. However, the base card view preview is generated by converting these images into Base64 JPEGs, which causes the transparency to be lost. As a result, the preview shows a black background in the light theme.
Is there a way to output the preview image as a Base64 WebP or PNG instead, so that transparency is preserved?

Here are what I want it to be:


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