On the audience settings we have a connection level option you can use

When you import from LinkedIn we don't get data like connection level, just name + link.

Only during an automation it will do enrichment of the lead and get the remaining data.

You'd need to use the qualify automation with the audience you want to filter by.

If you import a list from linked in and want to scrub it later based upon a custom audience inside flow chat. It seems the data is there.

What would be the purpose of doing this?