Hi,
In ECWID you can export your products into a CSV file.
kb.ecwid.com/w/page/26373353/Import-Export
kb.ecwid.com/w/page/61321037/Exporting%20store%20data
Thanks to that CSV file, by modifying a little the header you should be able to have a compatible CSV file which can be imported by HikaShop.
We do not have more details about the content of the CSV file generated by ECWID so it will be difficult for me, like that, to tell you more about it.
But I think that the import of ECWID import into HikaShop is possible.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.