Database
[{"myfield":{"Timestamp":{"UTCtimestamp":new Date("2022-03-18T08:24:40Z"),"offset":10}}},{"myfield":{"Timestamp":{"UTCtimestamp":new Date("2022-03-18T08:24:50Z"),"offset":100}}}]
Query
db.collection.aggregate([{$addFields:{"dateWithOffset":{$dateAdd:{startDate:"$myfield.Timestamp.UTCtimestamp",unit:"second",amount:"$myfield.Timestamp.offset"}}}},{$match:{dateWithOffset:{$gte:new Date("2022-03-18T08:24:45Z"),$lte:new Date("2022-03-18T08:24:50Z")}}}])