You can adjust the pricing on a per product basis under the Import List > Pricing & Profit. When pricing is adjusted here, those changes will apply only to the product in question. This is true for products from Wish.com and the Modalyst Marketplace.
The “Pricing & Profit” tab can be found highlighted in green in the right menu bar. The “Compare at Price” and “Price” can be edited directly on the interface. By contrast, the Item Cost and Shipping fields cannot be, while the Profit field is based on the sum of (Price - Item Cost - Shipping).