How to Export power apps solution from one tenant to another tenant in azure devops?

I believe you refer to PowerApps (canvas App). usually Canvas APP or Powerapps is mostly been used where dataverse (CRM) is also been used.

We usually create a solution in Dataverse and add canvas app to that solution. then using solution you can easily transfer/deploy your canvas app.

There are devops Tools provided by Microsoft. Take a look here