Help with firestore

I just started using kotlin on Android Studio and wanted to have a data structure that looks like the image below but how do I get/change the values in the calories and steps?

https://preview.redd.it/npfn42ottz181.png?width=1266&format=png&auto=webp&s=146869e04172774b0953bc53c8a54d02d22c5592

Thank you for the help

submitted by /u/Lhation
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