[[mySnippet? &my_param=`something`:my_output_filter]]
The filter has to come before the property string...
Can you use output filters directly on Snippet output? Like this:
[[mySnippet? &my_param=`something`:my_output_filter]]
I should just try this, but I thought I’d make my curiosity public...
[[mySnippet:my_output_filter=`my_output_modifer_value`? &my_param=`something`]]