plugins – How can I programattically add users dropdown list in Woocommerce Subscription add / edit page

Hope you are doing well.

Well I am using WordPresss’ Woocommerce plugin and using its paid plugin called as Woocommerce Subscriptions and its working fine as per my requirements.

Now I have a custom requirement. I want to add new dropdown which will have user’s list whenever I go to Subscription add/edit pages.

Hence I have installed ACF (Advanced Custom Fields) plugin and there I can get an option to create and show your custom fields based on post type and its working fine for me.

But I want to show programatically without using ACF plugin something like this , Here they are showing custom fields in user edit profile page only. I want to achieve something like this.

I have researched further and I am trying to find if there is any hook available inside Woocommerce subscriptions plugin or anything else.

Can someone guide me please how can I achieve the same from here on programatically ?

Any suggestion or guidance will be really helpful.