To to extract extremely nested data

I have a Custom webhook coming from Slack which relays messages when a Notion data base item is changed. I want to extract the notion database URL so I can extract the database ID from it but it is nested really far into the output. I think I probably need a map function or a get function but I can’t figure it out. Attached is the output I am getting from the webhook I want to extract event>blocks>2>fields>1>text (<https://www.notion.so/new-one-again-14ca3cfb82d9803e9f7bf7c1660f04cd?pvs=6&amp;n=events_page.created&amp;n=slack|new one again> in this example). Does anyone know the function to use?

Thank you