Advanced Page Template is a nice new approach to custom fields by page template. 
Please try to configure the custom fields easily in the template file itself using this plugin.
It doesn’t require to save any configuration data to database, just config the custom fields in template file itself as how wordpress recognize the templates – Its just wordpress way!
I think that it makes developing and deploying more easy and more sense for the developers. 🙂
Note: I highly recommend you to install and activate Advanced Custom Fields plugin so as to get its perfect benefit. Field Types only works with Advanced Custom Fields plugin.
<h4>Usage</h4>
Open a template file with any text editor and add some additional templating comment lines starting with @custom_field keyword:
Example 1:
<pre>
/*
* Template Name: 2column-layout
*
* @custom_field main, type: wysiwyg, label: Main content
* @custom_field sidebar, type: wysiwyg, label: Sidebar
*/
</pre>
Example 2:
<pre>
/*
* Template Name: Contact Page
*
* @custom_field photo, type: image, label: Photo of manager
* @custom_field phone, type: text
* @custom_field map, type: google_map
* 
* Note: The photo, phone, map are the custom field names in each '@custom_field' line,
* therefore use wordpress's 'get_post_meta' or ACF's 'get_field' method with those custom field names to get the values in this template. :)
*/
</pre>
Please bring the page edit link up in the backend and select the template which you just edited and hit ‘Update’ or ‘Save’ button. 
After page refreshing, You can’t miss new custom fields block from this template file.
Available Types and options with Advanced Custom Fields plugin are:
<pre>
/*
* @custom_field tab1, type: tab, instructions: Tab

* @custom_field field1, type: checkbox, choices: (1|2|3), label: Checkbox
* @custom_field field2, type: color_picker, label: Color Picker
* @custom_field field3, type: email, label: Email
* @custom_field field4, type: file, label: File
* @custom_field field5, type: google_map, label: Google map
* @custom_field field6, type: image, label: Image
* @custom_field field7, type: message, message: Message goes right here, label: Message
* @custom_field field8, type: number, label: Number
* @custom_field field9, type: page_link, label: Page link
* @custom_field field10, type: password, label: Password

* @custom_field tab2, type: tab, label: Tab

* @custom_field field11, type: post_object, label: Post object
* @custom_field field12, type: radio, choices: (1|2|3), label: Radio
* @custom_field field13, type: relationship, label: Relationship
* @custom_field field14, type: select, choices: (1|2|3), label: Select
* @custom_field field15, type: taxonomy, label: Taxonomy
* @custom_field field16, type: text, label: Text
* @custom_field field17, type: textarea, label: Textarea
* @custom_field field18, type: true_false, label: True/False
* @custom_field field19, type: user, label: User
* @custom_field field20, type: wysiwyg, label: Wysiwyg
*/
</pre>

Advanced Page Template

Advanced Page Template is a nice new approach to custom fields by page template.

o3world

Local JSON is a new feature added in version 5 which saves field group and field settings to files within your theme. The idea is similar to caching and both dramatically speeds up ACF and allows for version control over your field settings!
HOWEVER, the wp-admin field group edit screen will not load data from local json files, meaning you can not edit fields which are loaded from json files. This plugin solves this problem by creating an easy way to sync json fields into the database. This allows fields to be shared across multiple environments and contributors without having to export/import the database.
This plugin copies much of the functionality found in the Advanced Custom Fields export settings (advanced-custom-fields-pro/admin/settings-export.php).
<h4>Notes</h4>
<ul>
<li>Local Json folder filename must be the default acf-json.</li>
<li>Syncing down json fields will overwrite all fields stored in the database. Use with caution!</li>
</ul>

ACF Pro JSON Sync

Sync Advanced Custom Fields fields stored in json files into the database. Ideal for using ACF in multiple environments or in a team setting.

Advanced Page Template vs ACF Pro JSON Sync