On the theme,  cannot show the countdown on Collection. However, you can use this app to do it: Metafield Guru

+ After install app, go to App and config for it.

+ Choose the “Product & Variants”

+ Then choose the Product

+ You can set up for all the variants or one of them

1. Short description

1. namespace: meta

2. key: short_description

3. value: description excerpt content

Result:

2. Countdown

If want show countdown on page single product, you need to enter value date time for it.

1. namespace: event

2. key: countdown

3. value: value (yyyy/mm/dd)

Result:

 3. Additional Information:

Allow you enter external/Affiliate link, Add cart function will be hidden.

1. namespace: meta

2. key: additional_information

3. value: Enter information here

Result:

 4. Size Guide:

If you want to upload a different size guide image for each product (clothes, watch, shoes...) you can use metafield with the name: meta.size_guide and enter image link. See screenshot below:

1. namespace: meta

2. key: size_guide

3. value: image size chart URL

Result: 

The size chart will show:

5. Video

If want show video, you need enter youtube video link for it.

1. namespace: meta

2. key: video

3. value: youtube URL

Result:

6. External/Affiliate:

Allow you enter external/Affiliate link, Add cart function will be hidden.

1. namespace: purchase

2. key: on_link

3. value: [Button name]link to external product

Result