Creative Fabrica’s Transparent Background Maker is an innovative solution that allows you to remove backgrounds from images ...

A Picture Format dialog box will appear. On the Picture tab, under Transparency, drag the Transparency slider or click the spin button to increase and decrease the transparency. Then click OK.

For example, if you want to set acrylic transparent background for Command Prompt profile, then look/search for "commandline": "cmd.exe", value. Below that value, you will see “hidden”: false.