Bicep - Inject Xml

We want to inject API-M policies, which are xml files.
But in the InjectARM, you can just write plain xml and it is the InjectARM script that turns this into encoded values so the bicep can handle it.

When you use https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions-files you also do have this issue.

So basically I would like a bicep version of : https://github.com/arcus-azure/arcus.scripting/blob/main/src/Arcus.Scripting.ARM/Scripts/Inject-ArmContent.ps1

Start by reading src/Arcus.Scripting.ARM/Scripts/Inject-ArmContent.ps1 and the linked Bicep file-functions documentation. Compare how InjectARM turns plain XML into encoded values, then define the Bicep equivalent for injecting API-M policy XML and verify that the resulting values can be consumed by Bicep.

Written by the indexing model from the issue text.