Help with Query in Listings Element in Pagebuilder

I’m using the Listings element in page builder and have been playing around with the Query field.
I can use:

meta_key=post_tags&meta_value=keyword1
and that’s fine, it displays listings where tags field equals ‘keyword1’.

Is there a way to display listings where tags contain keyword1 so if a listing has tag field set to ‘keyword1, keyword2, keyword3’ it will still display.

Effectively I want
meta_key=post_tags&meta_value contains keyword1 – this obviously isn’t correct syntax but is there an actual syntax to do this?