Mass Update Subscription Product Custom Attributes

Hello,

We have subscriptions and products and they have some custom attributes to indicate price increase index.

When we use Mass Update feature to update subscriptions, we want to select and update the price for selected subscriptions, however in the same process, we want to update the custom attributes on subscriptions and products.

However we dont see the custom attributes on the screen, please see attached screenshot.

Could you please advise, how the business users can perform this (without REST web service or FBDI)?

Thanks,

Girish