callout in bash source code with line continuation

If I create documentation like this:

[source,bash]
----
ls \
-lrt
----

asciidoctor will render the html that an be copied and pasted into a bash shell.  It executes without errors.   Is there a way to add a callout for line 1 without causing errors when copied and pasted into a bash shell?  I have tried this:

[source,bash]
----
ls \ <1>
-lrt
----
<1> this is line 1

The issue it seems is that the callout mechanism requires a space to be added at the end of line 1 of the bash script in order for the <1> to be recognized.  The bash backslash character is intended to escape the newline and not the space character.  Is there a way to prevent the rendered html to exclude the literal space in line 1, for example?

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