Way to dynamicaly generate values within shortcode?

Hi,

I got trouble using some complex custom shortcodes. I’m using ACF for custom user-profile-content (e.g. phone number). Now, to load these values into the form, I need to add the current user’s ID within the ACF’s shortcode. Example:
<label>phone: [dynamictext* phone "acf field='field_phone' post_id='user_X'"]</label>
where in user_X the X should be the actual user’s ID.

My recent idea was to do the math in another shortcode, so give the "acf field='field_phone' post_id='user_X'" to another custom shortcode returning a calculated shortcode (e.g. "acf field='field_phone' post_id='user_1'"), that will be used by CF7. Will that be possible, as it’s like a iterated shortcode?

Is there a easier way to achieve the task?

Thanks in advance!