Unfortunately, this area of the checkout isn't editable at the moment. 

A possible work around is to add card logos to the footer of your website to appear on every page.

To do this, go to BlockLab:

Then click Footer: 

Then click Block, and select New: 

Then click Payments:

Select the relevant payment provider(s) and choose the icon style, then click Add:




Finally click publish in the top right to update the front end website: