How to implement Jwt authentication with the refit library and have it to cache the bearer token for a certain duration?

Question

I'm writing a .net core console application to run a set of background jobs. The jobs target a Rest API so I'm using Refit library.

The library is quite straightforward but for the authentication part it's a little bit unclear how to achieve it in a clean way.

I have a rest resource for authentication: server/auth/token/acquire

In the body I should send a JSON containing the account and password and then the server sends back an authentication response in the form of :

{
  Token: "",
  Validity : "",
  ExpiresAt : ""
}

I need also a way to cache the token for a duration that is equal to Validity value.

How can I use refit to fulfill these requirements ?

Thanks for helping.