Transaction log General Purpose -Serverless

Based on the Azure SQL Serverless documentation:
"Azure SQL Database automatically shrinks transaction log file to avoid excessive space usage that can lead to out-of-space errors.
It is usually not necessary for customers to shrink the transaction log file."
I have been checking the transaction log file size for a database and the space is never reclaimed.
Is the transaction log cleared and reclaimed space with the regular backups?
Is the space used by the transaction log charged?