color gradient in Adobe Express

I have a little question about color gradient, which is hope somebody here might be able to answer.

I am currently working on social media posts for a customer with a set corporate design, which includes elements with a color gradient. Yet i cannot find a way to recreate said color gradient in Adobe Express. Normally I would just import the old design elements from Adobe XD, but the design requires small changes on every post regarding their size, which Express doesnt implement the same way as XD, resulting in a violation of the corporate design.

Is there any way to import a color grading straight into my brand kit, or did I maybe overlook an opportunity to establish one in Express itself? 

I´m looking forward for your answers and want to thank you for your time in advance.