Webhook timeout when calling long-running funcs

[aus70]

I'm using a locally-hosted Large Language Model to generate bot replies, and sometimes a few seconds are needed to return a 200 OK to the webhook, which leads to the following error:

** (EXIT) time out
    (elixir 1.15.0) lib/gen_server.ex:1074: GenServer.call/3
    (ex_gram 0.40.0) lib/ex_gram/updates/webhook.ex:34: ExGram.Updates.Webhook.handle_cast/2

It would be nice to be able to increase the timeout from 5000ms to some longer interval or to return a 200 OK before calling long-running functions: what's the best way to do it?

Thanks.