Hi Teh,
It seems that you could import data for org chart.
Just make sure that Company Name and parent contact fields have been added in your custom view for import.
Below are my steps:
1. Create the custom view for contact entity:

2. Export the view as upload excel template
Contact entitylist > Excel Templates > View All My Template:

In Download to Create Excel Template dialog, set the previous custom view.

3. I added two new records,(row 4 and row 5) and just copy two lookup field text value into new record's fields.

4. Import the excel into Marketing, 2 records are created, due to step 3,
those people are all in same company, and Clofly is the manager for other 4 records.

5. We can also find new change in account org chart.

Regards,
Clofly