How to Reference the Value of an Input That Has a `dmx-bind:id`?

I have a text input in a repeat, so it has a dynamic id like this:

dmx-bind:id="i_social_media_post_link_{{location}}"

I now want to reference the value of this input in a data store update: what do I reference to do this?

I’ve tried using value in the example below and it doesn’t work, it returns and [object object]

dmx-on:updated="post_locations.update({post: this_social_media_post.value, location: location},{post_link: value})

What should I put as the value for my post_link field of the datastore?

Best wishes,
Antony.

PS - for reference, the complete input item is below, and I have checked that {{location}} has a value!

<input dmx-bind:id="i_social_media_post_link_{{location}}" name="post_link" type="text" class="form-control input_text" dmx-bind:value="post_link" placeholder="Post link:" dmx-on:updated="post_locations.update({post: this_social_media_post.value, location: location},{post_link: value})">