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InfluxDB
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You could try something like JScript Panel with the included 'JS Playlist' sample. Though it would not look exactly like your "concept idea" - I think the artwork only shows for the group header (so one thumbnail per artist?) - I guess you could make a custom grouping by track %title% to get one thumbnail per track in a playlist? I'm not super familiar with these scripts so perhaps u/marc2k3 would know more (of the entire situation).
I think current versions of Columns UI support WebP so you could try that as well. (A completely different user interface so you'd have to redesign your layout, a little more effort...)