There is no visual representation of parameters in the Javascript Blocks editor, but you can drop into javascript to do this - and you can then come back to blocks and it makes it's best attempt to render it in grey blocks.



basic.forever(() => {
stuff(1,2)
stuff(3,4)
})
function stuff(a: number, b:number) {
    basic.showNumber(a)
basic.showNumber(b)
}




You can find more information on this in the makecode javascript docs