Having trouble working out what you are trying to achieve here. You are trying to set a code block with Markdown highlighting within a code block with Markdown highlighting?
Why not just set the whole lot in one block? I have used the type "text" here.
```text
func(par1, par2)
func(par1, par2)
func(par1, par2)
```
Outputs as:
func(par1, par2)
func(par1, par2)
func(par1, par2)