How to Add Labels or Sub Labels in Azure Pipeline Run window

I have a requirement to write my own parameters in the Azure pipeline and I was able to display the text box as shown in the image below the problem I am facing is I am not able to add my own subtext in labels like the one I marked in red

My YAML code is like this

parameters:   
  
  - name: ProjKey
    displayName: Project Key KSK
    type: string
    default: ''
    
# wanted to display Supporting sub text below text box