Task: Render custom text over images

n8n workflow:
{"id":"46","name":"Cocktail Recipe Sharing","nodes":[{"name":"Bannerbear","type":"n8n-nodes-base.bannerbear","position":[650,300],"parameters":{"templateId":"","modificationsUi":{"modificationsValues":[{"name":"cocktail-image","imageUrl":"={{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strDrinkThumb\"]}}"},{"name":"title","text":"={{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strDrink\"]}}"},{"name":"recipe","text":"={{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strInstructions\"]}}"}]},"additionalFields":{"waitForImage":true}},"credentials":{"bannerbearApi":"Bannerbear"},"typeVersion":1},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[450,300],"parameters":{"url":"https://www.thecocktaildb.com/api/json/v1/1/random.php","options":{}},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[250,300],"parameters":{"triggerTimes":{"item":[{"hour":18,"mode":"everyWeek","weekday":"5"}]}},"typeVersion":1},{"name":"Rocketchat","type":"n8n-nodes-base.rocketchat","position":[850,300],"parameters":{"channel":"","options":{},"attachments":[{"imageUrl":"={{$node[\"Bannerbear\"].json[\"image_url\"]}}"}]},"credentials":{"rocketchatApi":"Rocket"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Cron":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]},"Bannerbear":{"main":[[{"node":"Rocketchat","type":"main","index":0}]]},"HTTP Request":{"main":[[{"node":"Bannerbear","type":"main","index":0}]]}}}