Create your own function in Azure Bicep with user-defined functions blog

function-module-arguments.bicep

@description('''
  Pass arguments to use in the deployment script. Default: Empty Object
  Example value:
  {
    name: 'value'
    value: 'value'
  }
''')
param parArgument object 

@description('Delimiter variable is used for the join() method')
param parDelimiter = ' '

var varJoined = !empty(parArgument) ? join(map(items(parArgument), arg => '-${arg.key} ${arg.value}'), varDelimiter) : ''

@description('''
  Example output:
  -name value -value value
''')
output outArguments string = varJoined