add expressions to `:fields` inside of pre-add-implicit-fields instead of using a separate QP middleware function.
add expressions to `:fields` inside of pre-add-implicit-fields instead of using a separate QP middleware function.

blueoceanideas/metabase,blueoceanideas/metabase,blueoceanideas/metabase,blueoceanideas/metabase,blueoceanideas/metabase