You can't 

Experience builder basemap widget don't have create a new basemap option. 

 

Not like web appbuilder, you can 

how to add nearmap image server as base map on web app builder

 

https://transparentgov.net/cleargov1/1420/how-to-add-nearmap-image-server-as-base-map-on-web-app-builder?show=1420#q1420

 

So what is work around?

 

You can add nearmap image server layer as basemap in web map.

 

 

Step 1

find the nearmap portal item, if you don't have yet, create a new portal item

 

 

 

 

Step 2

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 3

open web map

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 4

paste URL here, don't forget to check USE AS Basemap option.

 

 

 

 

 

 

 

 

 

 

 

 

Step 5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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