This process is an ongoing effort, with an upfront engineering commitment which depends entirely on the product, but can be months of work. But if you have your own backend, I would argue this hard works is made HARDER by implementing something like Salesforce/Fin, because you have to now pipe a bunch of data and structure over to them, which is a pain.
LLM models capable of doing this are a commodity, the UI for customers and support teams is pretty trivial, the database/backend is trivial.
Outside of some cases, if you have your own app, and you have a given support volume, build your own.