Refering to a structure field by it's number

Hi,

I think i've seen it somewhere, but can't find it now

Is it possible to refer to a structure component by it's number rather then by it's name?

For example if structure ZSTRUCT consists of fields: ZFIELD1, ZFIELD2 and ZFIELD3

Can I refer to ZSTRUCT-ZFIELD2 as to 2-nd field of ZSTRUCT rather then to ZFIELD2 field of ZSTRUCT?

Thank you in advance.