This is custom snippet to overwrite blog template for category archive page.

overwrite_blog_template.php

<?php // Do not include this line in your functions.php file. 

add_filter( 'astra_blog_template_name', function( $name ) {
    
    // Replace `block` with your category slug. 
    if( is_category( 'block' ) ) {
	return 'block';
    }

    // For category with slug "book". You need to add template file `blog-layout-book.php` file to get this work. 
    if( is_category( 'book' ) ) {
	return 'book';
    }
	
    return $name;
} );