Couldn't you just add this to your shopping list or to-do list? Just think of it as a "memo list"
Yes.... but no. They are conceptually different.
What if you have entered 60 items into the "where is" list? You ask Alexa "Where are the scissors", and she repeats the entire list, 5 items at a time, until she reaches item 57 which are the scissors?
What the OP is suggesting is a skill (let's call the skill 'Jenny') that takes the spoken phrase "Alexa, tell Jenny the scissors are in the top drawer next to the kitchen sink" and parses it out into two components: the object, and the description. Each component gets stored in a table. Then when someone else asks "Alexa, ask Jenny where are the scissors?" The skill puts "the scissors" in a variable, matches that variable against column 1 of the table, and based on it extracts the item in column 2 into the response variable and responds: "[Variable1] is [Variable2]" which Alexa then speaks as "The scissors are in the top drawer next to the kitchen sink".
And that could go waaay beyond location. 'Jenny' could respond to 'where', 'how', etc. So imagine your wife cooked you dinner, then had to leave for an emergency, then you have to leave for the night shift. You say "Alexa, tell Jenny dinner is delicious". Wife comes back from the emergency, says "Alexa, ask Jenny how is (was?) dinner"? Alexa replies "Dinner is delicious".
EDIT: it might be even simpler. I've not yet explored the API for Alexa, but it might indeed be as simple as a single column list against which a search word is deployed. For example, in Excel if you type a column of perhaps six phrases and then search the worksheet for any one word (or part a word), it goes to the cell containing the entire phrase.so if one of the entries says "the weather is cloudy" and you search 'cloud', it takes you to that cell.
This skill is probably very easy to write. And hypothetically, could include any phrase you want.
You might have two discrete skills: Tell Jenny, and Ask Jenny.
"Alexa, Tell Jenny the scotch tape is in the credenza middle drawer".
Then....
"Alexa, Ask Jenny "scotch tape" ".
Tell Jenny compiles the list as phrases, and Ask Jenny searches keyword and returns any/all items that contain it.