Could shader waver add a node or something that can make the brighter part of texture into HDR source so if you can see them "blooming" in camera with unity bloom post processing ?
It can be easily done in Shader Weaver. Connect a mask node to the left of the image node, this mask node show the brighter part. Then duplicate the image node and link it to the mask, right click the color of it for switching to HDR, set brightness whatever you want.
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