Create a depreciation analysis table

Hello,

This topic is a continuation of my 1st post here,
Thanks to the contributors, I realised that it wasn't possible to create a custom table directly in Power Pivot Excel, at least not in the way I thought.
So I created a calendar table in Power Query and loaded it into Power Pivot.

The M code for the calendar table isn't great, but it works

Now I'd like to continue to the end.
If I understand correctly, I need to create 2 measures to obtain the final result.
And I'm already getting stuck

Can you please help me to create these 2 measurements ?

Thanks in advance

Best regards

let
    Source = {Number.From(#date(2020,1,1))..Number.From(#date(2022,12,31))},
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Changed Type" = Table.TransformColumnTypes(#"Converted to Table",{{"Column1", type date}}),
    #"Renamed Columns" = Table.RenameColumns(#"Changed Type",{{"Column1", "Date"}}),
    #"Added Custom Column" = Table.AddColumn(#"Renamed Columns", "Custom", each Text.Combine({Date.ToText([Date], "yyyy"), "0", Date.ToText([Date], "%M")}), type text),
    #"Renamed Columns1" = Table.RenameColumns(#"Added Custom Column",{{"Custom", "YM"}})
in
    #"Renamed Columns1"