You could install 1 - 3 pcs of these 1.8 kW chargers:
https://www.aliexpress.com/item/32978727695.html
https://www.aliexpress.com/item/32852367155.html
https://www.aliexpress.com/item/32850580369.html
With 3 of these you will get the 5.4 kW charging power. It will take about 2 hours to charge...