I'm a little stupid, for the .env item what should i add? my wrangler.toml file looks like this but

I'm a little stupid, for the .env item what should i add? my wrangler.toml file looks like this but i dont think its working:
[[d1_databases]]
binding = "DataB"
database_name = "thing"
database_id = "dwadwadwad3213dsfasfdaeiu2"

if i have to create a .env file would i format it the same way?
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