Using dotnet secret

in .csproj file create <UserSecretsId> tag under PropertyGroup like this

<UserSecretsId>MyApiName-SomeGUIDOrAnythingUnique</UserSecretId>

in the command line

dotnet user-secrets set "Kestrel:Certificates:Development:Password""pa55w0rd!"

it's a key value pair

it thne creates a secrets json in "C:\Users\<ProfileFolder / Username>\AppData\Roaming\Microsoft\UserSecrets

it's a hidden file

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Look also : Creating a self-signed cert for localhost