Just implement such a filter if you need it.
yes. please help me a tutorial for fillter striptag
Did you even read docs ? https://docs.phalcon.io/pl/latest/reference/volt.html#filters Volt already have striptags filter built-in
https://php.net/manual/en/function.strip-tags.php
So this code:
{{ value|striptags('b', 'a') }}
Should already work.