… with this code you can display thumbnails directly in a SharePoint
{
"$schema": "http://columnformatting.sharepointpnp.com/columnFormattingSchema.json",
"elmType": "div",
"children": [
{
"elmType": "img",
"attributes": {
"src": "@currentField",
"title": "=if(@currentField == '', '', @currentField)"
},
"style": {
"position": "relative",
"top": "50%",
"left": "50%",
"width": "48px",
"height": "auto",
"margin-left": "-50%",
"margin-top": "0%"
}
}
]
}

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