How to access field in structure where fieldname is inside of a variable?

Hi,
Through searching number of old threads here on forums i learnt that i can get dynamic field names from a table with "assign component" syntax.
So i have my fieldname inside a field symbol <fs_fieldname>. I want to use this fieldname to access a field in another structure ls_structure.
My syntax that is not working that i need help with is:
ls_structure-<fs_fieldname> = 'HELLO'.
How can I refer to ls_structure's field where the fieldname is in the field symbol <fs_fieldname>.
thank you

Check this
      field type string,
     end of ls_structure.
data:lv_field type string.
field-symbols:<fs> type string.
lv_field = 'FIELD'.
ls_structure-field = 'Hello'.
assign lv_field to <fs>.
if sy-subrc = 0.
concatenate 'LS_STRUCTURE-' <fs> into lv_field.
unassign <fs>.
assign (lv_field) to <fs>.
if sy-subrc = 0.
    write <fs>.
    <fs> = 'Changed data'.
    skip 1.
    write ls_structure-field.
endif.
endif.

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