The developer of 只要生鲜 is Chao Wang and all inquiries must go to them.
The GDPR gives EU and UK residents a "right to erasure" meaning that you can request app developers like Chao Wang to delete all your data it holds. Chao Wang must comply within 1 month.
The CCPA lets American residents request that Chao Wang deletes your data or risk incurring a fine (upto $7,500 dollars).