json path where equals, clause

Input:

{
   "data":[
      {
         "in":"instance1",
         "wal":"1"
      },
      {
         "in":"instance2",
         "wal":"0"
      }
   ]
}

Sample 1:

jq --arg name "instance1" '.[] | .[] | select(.wal  == $name).in' db.log

Sample 2:

jq --arg name "0" '.[] | .[] | select(.wal  == $name).in' db.log