How to use TAG for controlfile autobackup

Hi,  I have the below script to backup the database. I am using the TAG for the FULL backup but due to controlfile autobackup on, RMAN creates a different piece for controlfile backup with default TAG. I want to use my own TAG for controlfile backup piece.

Is it possible? if yes how can I achive this? Please also suggest me if anything is wrong with my script.

connect target/
run {
allocate channel ch1 type 'sbt_tape'
parms='BLKSIZE=1048576,SBT_LIBRARY=$ORACLE_HOME/lib/libddobk.so,ENV=(STORAGE_UNIT=name,BACKUP_HOST=name)';
allocate channel ch2 type 'sbt_tape'