Task: Create an image procedurally using Bannerbear

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Bannerbear","type":"n8n-nodes-base.bannerbear","position":[450,300],"parameters":{"templateId":"8BK3vWZJ7Wl5Jzk1aX","modificationsUi":{"modificationsValues":[{"name":"message","text":"this is some text","color":"#3097BC","background":"#28A96F"}]},"additionalFields":{"waitForImage":true}},"credentials":{"bannerbearApi":"bannerbear_creds"},"typeVersion":1}],"connections":{"On clicking 'execute'":{"main":[[{"node":"Bannerbear","type":"main","index":0}]]}}}