That is the bolt address, i.e. neo4j+s://myhash.databases.neo4j.io and presuming myhash is replaced by some alphanumeric string.
If you launch a browser, Chrome, Firefox, etc and paste https://browser.neo4j.io/ into the URL location field you can then include this neo4j+s://myhash.databases.neo4j.io in the Connect URL on the authentication form so as to connect.
But ...
..which doesn't work if i put that as the url in tomaz's llamaindex notebook: blogs/llm/llama_index_neo4j_custom_retriever.ipynb at master · tomasonjo/blogs · GitHub
doesnt work? how so? does it give you an error ? does it hang? give you wrong results?