How to get/set cookies and headers using Chrome Custom Tabs?

Question

HTTP Cookies

Hello. Is it possible to get and set headers and cookies using Chrome Custom Tabs (you need to use them). I came across this article . This describes the process of injecting headers into a request. Cookies, as far as I know, can be set simply by passing header: Cookie(s): and here is a list of them. But I haven't been able to find how to get them . But reading articles I found information that when using Chrome Custom Tabs, cookies are rummaged with chrome (the Custom Tab shares the cookie jar with Chrome). It is necessary to receive cookies immediately after loading the page. I already read about the download event itself, I think there will be no problems with this, but the problem of obtaining a cookie remains.
Question again: how to get cookie after page load in Chrome Custom Tabs?
Thank you.