There is no option for first default(blank) option to give user text

You can use first_as_label option like this:

[select* your-country first_as_label "-- Choose Your Country --" "China" "India" "San Marino"]

Try this…

[select* whateverID first_as_label “Please Choose…” “Option 1” “Option 2” “Option 3”]

The first option then becomes “Please Choose…” but if it is chosen by the user validation will fail, they have to choose a different option.

Hope this helps.

Thank you @takayukister and @fonefixer for your reply

It’s working fine.