I'm pretty sure that if priced reasonably, it would be a huge hit in Spain.
- Xiaomi has a huge chunk of smartphone sales: currently #1 brand in Spain, with almost 30% of the market.
- Chinese cars already cope 20% of EV sales in Spain: there's not as much "oh, it's Chinese, it must be bad quality" mentality in Spain as in other countries. Spanish people are more concerned about the quality/price ratio, regardless of the country of origin. Xiaomi makes great high quality phones that are generally less expensive than Samsung or Apple, so they'll go for the less expensive one. Why pay more for less?
Pack those 2 together and it would be a landslide for Xiaomi.
Either way, Xiaomi is not in a hurry to expand, as they still can't make cars quickly enough for their own country.