Selecting an Item in a Cascading Dropdown List

[Davider]

I'm facing a challenge with a web form in Google Chrome that involves selecting an item across multiple levels in a cascading dropdown list. Please refer to the demonstration in the link below.
https://i.ibb.co/pbPGz3S/A.gif

Steps:

1. Hovering over a column and using the mouse wheel to scroll to find an item, which triggers a sublist to appear automatically.
   
2. Once the target at the lowest level is located, clicking on the text with the mouse.
   

I was able to achieve this using commercial RPA software, but there’s a high chance of selecting the wrong item, which is unacceptable.
This webpage is private and not publicly accessible, and I haven’t found any sample forms for testing. Does anyone have suggestions or solutions? Thank you very much.
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Demonstration of the Layout Structure for Cascading Dropdown Lists
https://i.ibb.co/KsyhmgV/B.gif