expand initials in documents for PAN and Aadhaar when no proof exist

My name is written as BM Saada in my birth and school certificate.In my Aadhaa,it is printed as Saada BM,now I am applying for PAN,where initials are not accepted.PAN portal is asking for full expanded name instead of just initials.But,i dont have any document where my initials are expanded.The full form would be ‘Bathool Maryam Saada’, but this is not written anywhere officially.Can I create a name expansion affidavit declaring that B stands for Bathool and M for Maryam, and use it for apply?