The validation array contains a specific value using joi

I am looking for a way to check that an array contains the required value using joi .
Found these questions online - # 1 , # 2 , but none of them have a definitive answer.
I tried several things, but they don't seem to work, for example:
joi.array().items(joi.string().allow('required-string').required())

joi.array().items(joi.string().label('required-string').required())

joi.array().items(joi.string().valid('required-string'))

This is what I am trying to achieve:

Received:

['required-string'], ['required-string', 'other'], ['other','required-string'], ['other',...,'required-string',....,'more-other']

      

        
        
        
      

    

Denied:

[], ['other'], [null], etc..