[CHANGE CHECK] jsonConfig add iframe and iframeSendTo

### I'm sure that

- [x] There is no other (open) issue with the same topic (use the search!)

### Complete issue line reported

n/a

### Description of suggested change

Shows an iframe with the specified URL. (from Admin 7.7.24)

### Link to repository

_No response_

### Checker version

5.1.1