Hi there,i am new in odoo.

I am using odoo18, i want to customized contact export.
when we click on contact => export action and a dialogbox appear, i want to add a custom dropdown on it that will be displayed the list of the campaign and list of the campaign will be get from the third party using api.

please guide me which default file will be used for displaying export dialogbox and export functinality? and what the file name of my custom module views and models?

because i also what when click on action => export => select campaign => export button then selected contact will be exorted on my third party also through the api

how we can do it?