add 'enctype' => 'multipart/form-data' in editview templateMeta with manifest.php file with pre/post install function

[Fieztech]

I’m creating custom filed type file with insatllable package that is working fine
i need a way to set — ‘enctype’ => ‘multipart/form-data’ – in edit view template meta
i know their is a pre_install or post_install function in manifest.php
can anyone have complete script for adding — ‘enctype’ => ‘multipart/form-data’ – in edit view template meta form