Is there a node that can access Airtable Metadata API?

What you can do is use your existing AirTable credential in an http node like this:

Note you might need to add query paremeters etc - you’ll have to consult the AirTable API docs to figure out the proper way to build the HTTP request

EDIT: Updated my example to include the required header (you’ll need to replace the $USER_API_KEY with your own obv)

Hope that helps,