Task: Spotify Play List to WordPress Embed Block

n8n workflow:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[-100,320],"parameters":{},"typeVersion":1},{"name":"Spotify","type":"n8n-nodes-base.spotify","position":[120,320],"parameters":{"id":"={{$json[\"PlaylistURL\"]}}","resource":"playlist","operation":"getTracks"},"credentials":{"spotifyOAuth2Api":{"id":"1","name":"Your Spotify account"}},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[300,320],"parameters":{"values":{"string":[{"name":"TrackName","value":"={{$json[\"track\"][\"name\"]}}"},{"name":"ArtistName","value":"={{$json[\"track\"][\"artists\"][0][\"name\"]}}"},{"name":"TrackURL","value":"={{$json[\"track\"][\"external_urls\"][\"spotify\"]}}"}]},"options":{},"keepOnlySet":"={{true}}"},"typeVersion":1},{"name":"Wordpress","type":"n8n-nodes-base.wordpress","position":[800,320],"parameters":{"title":"Spotify","additionalFields":{"content":"={{$json[\"card\"]}}"}},"credentials":{"wordpressApi":{"id":"3","name":"Your Wordpress"}},"typeVersion":1},{"name":"Create Spotify Card","type":"n8n-nodes-base.functionItem","position":[480,320],"parameters":{"functionCode":"return {\nspotify_card: \n`<!-- wp:embed {\"url\":\"${item.TrackURL}\",\"type\":\"rich\",\"providerNameSlug\":\"spotify\",\"responsive\":true,\"className\":\"wp-embed-aspect-21-9 wp-has-aspect-ratio\"} -->\\n\n<figure class=\"wp-block-embed is-type-rich is-provider-spotify wp-block-embed-spotify wp-embed-aspect-21-9 wp-has-aspect-ratio\">\\n\n<div class=\"wp-block-embed__wrapper\">\\n\n${item.TrackURL}\\n\n</div></figure>\\n\n<!-- /wp:embed -->`\n}"},"typeVersion":1},{"name":"Prepare Response1","type":"n8n-nodes-base.function","position":[640,320],"parameters":{"functionCode":"let card =\n`${items.map(e => e.json.spotify_card).join('\\n')}`;\n\nreturn [{\n  json: {\n    card: card\n  }\n}];"},"typeVersion":1}],"connections":{"Set":{"main":[[{"node":"Create Spotify Card","type":"main","index":0}]]},"Spotify":{"main":[[{"node":"Set","type":"main","index":0}]]},"Prepare Response1":{"main":[[{"node":"Wordpress","type":"main","index":0}]]},"Create Spotify Card":{"main":[[{"node":"Prepare Response1","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Spotify","type":"main","index":0}]]}}}