Task: Send or update new Mailchimp subscribers in HubSpot

n8n workflow JSON:
{"meta":{"instanceId":"237600ca44303ce91fa31ee72babcdc8493f55ee2c0e8aa2b78b3b4ce6f70bd9"},"nodes":[{"id":"35451a0c-1ad5-4c02-804b-d19afd282b09","name":"Get last execution timestamp","type":"n8n-nodes-base.functionItem","position":[540,100],"parameters":{"functionCode":"// Code here will run once per input item.\n// More info and help: https://docs.n8n.io/nodes/n8n-nodes-base.functionItem\n// Tip: You can use luxon for dates and $jmespath for querying JSON structures\n\n// Add a new field called 'myNewField' to the JSON of the item\nconst staticData = getWorkflowStaticData('global');\n\nif(!staticData.lastExecution){\n  staticData.lastExecution = new Date();\n}\n\nitem.executionTimeStamp = new Date();\nitem.lastExecution = staticData.lastExecution;\n\n\nreturn item;"},"typeVersion":1},{"id":"18ff2308-216e-4c1e-afb9-bd41ae7b5e4d","name":"Every day at 07:00","type":"n8n-nodes-base.cron","position":[320,100],"parameters":{"triggerTimes":{"item":[{"hour":7}]}},"typeVersion":1},{"id":"53d3203b-2518-471f-9c72-2ab41303cdf2","name":"Set new last execution timestamp","type":"n8n-nodes-base.functionItem","position":[1240,100],"parameters":{"functionCode":"// Code here will run once per input item.\n// More info and help: https://docs.n8n.io/nodes/n8n-nodes-base.functionItem\n// Tip: You can use luxon for dates and $jmespath for querying JSON structures\n\n// Add a new field called 'myNewField' to the JSON of the item\nconst staticData = getWorkflowStaticData('global');\n\nstaticData.lastExecution = $item(0).$node[\"Get last execution timestamp\"].executionTimeStamp;\n\nreturn item;"},"executeOnce":true,"typeVersion":1},{"id":"bf6f8843-53e8-4096-8614-da0b43f5f193","name":"Create/Update contact","type":"n8n-nodes-base.hubspot","position":[1020,100],"parameters":{"email":"={{ $json[\"email_address\"] }}","resource":"contact","authentication":"appToken","additionalFields":{"lastName":"={{ $json[\"merge_fields\"].LNAME }}","firstName":"={{ $json[\"merge_fields\"].FNAME }}"}},"credentials":{"hubspotAppToken":{"id":"13","name":"HubSpot App Token account"}},"typeVersion":1},{"id":"6bce7f89-e22e-4372-a1cc-1723756bb617","name":"Get changed members","type":"n8n-nodes-base.mailchimp","position":[780,100],"parameters":{"list":"bcfb6ff8f1","options":{"sinceLastChanged":"={{ $json[\"lastExecution\"] }}"},"operation":"getAll"},"credentials":{"mailchimpApi":{"id":"19","name":"Mailchimp account"}},"typeVersion":1}],"connections":{"Every day at 07:00":{"main":[[{"node":"Get last execution timestamp","type":"main","index":0}]]},"Get changed members":{"main":[[{"node":"Create/Update contact","type":"main","index":0}]]},"Create/Update contact":{"main":[[{"node":"Set new last execution timestamp","type":"main","index":0}]]},"Get last execution timestamp":{"main":[[{"node":"Get changed members","type":"main","index":0}]]}}}