Though you can submit sequence data including SNP (Single Nucleotide Polymorphisms) to DDBJ, the data will not automatically reflect to dbSNP.
dbSNP is an independent database from INSDC, operated by NCBI.
For SNP data, we recommend you to submit to dbSNP.

In case of submission to DDBJ, see format of feature annotation at B13) polymorphism and variation on Example of Submission.

Where to submit variation data, such as single nucleotide variations, structural variations, copy number variations (CNVs) and so on?
How to submit sequence data related to DNA polymorphism?