Creation and update date of a page

Hello,

The format I want is creation (Fecha de creación:) and update date (actualizado el:)at the end of the page, not at the begining. I must add the code to every page.

The only solution I found is to add the values using columns, see the code underneath:

Nevertheless, in Mobile the content of the columns is splitted and the result really awful.

CODE GENERATED:

<!-- wp:group {"layout":{"type":"flex","flexWrap":"nowrap"}} -->

<div class="wp-block-group"><!-- wp:paragraph {"fontSize":"small"} -->

<p class="has-small-font-size"><strong>Fechas creación :</strong></p>

<!-- /wp:paragraph -->

<!-- wp:group {"fontSize":"small","layout":{"type":"flex","orientation":"vertical"}} -->

<div class="wp-block-group has-small-font-size"><!-- wp:columns -->

<div class="wp-block-columns"><!-- wp:column {"width":"100%"} -->

<div class="wp-block-column" style="flex-basis:100%"><!-- wp:post-date {"fontSize":"small"} /--></div>

<!-- /wp:column --></div>

<!-- /wp:columns --></div>

<!-- /wp:group -->

<!-- wp:paragraph {"fontSize":"small"} -->

<p class="has-small-font-size">; <strong>actualizado el</strong>:</p>

<!-- /wp:paragraph -->

<!-- wp:group {"layout":{"type":"flex","flexWrap":"nowrap"}} -->

<div class="wp-block-group"><!-- wp:post-date {"displayType":"modified","fontSize":"small"} /--></div>

<!-- /wp:group --></div>

<!-- /wp:group -->

https://justearte.com/vlb-memorias-v1/c01/

Is there is a way to get a best result, publishing creation and updated dates at the end of the page without colums, all in a row, as "Creation date: XX-XX-XX; last updated: XX-XX-XX"?