yes, you can show your client section on Gradiant theme from a customize you can also add more client section.
Let’s scroll down to create a client section.
WordPress Dashboard > Appearance > Customize > Frontpages Section > click on client Section
In the client section, you can see the Header from there you can create a title and description
WordPress Dashboard > Appearance > Customize > Frontpages Section > click on client Section
In the client section, you can see add New & fill title & subtitle with link and image.
In content, you can select columns according to you.
