About creating custom fields

I use Jet Engine by Crocoblock.

I want to use WP ALL IMPORT to assign spreadsheet items to metafields (custom fields) and create and post multiple articles at once.

However, the names (slugs) I set for the metafields are not displayed in the custom field items. (I’m using the free version.) So I would like to know if Jet’s metafields are only available in the paid version. Or are Jet Engine’s metafields not available?

I don’t want to import all of WP.

I just want to post the information in the spreadsheet in bulk with WP ALL IMPORT. In that case, you need to assign items to metafields