Would anyone please help me with how to use f7v3 Autocomplete Render Functions?

Would anyone please help me with how to use f7v3 Autocomplete Render Functions?
The functions such as:
renderDropdown
renderItem

Please help.

You need to return in those functions html code, refer to source code for examples https://github.com/framework7io/framework7/blob/master/src/core/components/autocomplete/autocomplete-class.js#L516