how can we implement dropdown in an efficient way to implement the same along with handling focus
You could use:
I recommend asking that team to build a drop down.
Dropdown should just be a column of items that you show / hide. Just lazy create it when users enters on the dropdown.
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Thank you for your reply @chiefcll . Could you please tell how to contact their team?
I see you posted an issue already… 
yes, I did. Thank you… 