Hi
No, the plugin uses the custom fields as they were saved. I looked through the WP code and there aren’t any actions or filters to use when reading custom field data.
One solution might be to use these hooks to strip the tags when the custom fields are saved, or you could use them to save the stripped data to a new field:
add_{$meta_type}_meta
update_{$meta_type}_meta
There is some more info here and in the WordPRess codex:
https://developer.wordpress.org/reference/hooks/add_meta_type_meta/