put structured_pattern values from sheets2linkml in the syntax sub-slot

[turbomam]

sheets2linkml does honor structured_pattern column specifications

slot	structured_pattern
name	{firstname} {lastname}

but just serializes them like this:

structured_pattern: {firstname} {lastname}

I also tried using syntax as the column specification but got an error

My minimal desired outcome is that the cell contents are placed in a structured pattern's syntax slot:

structured_pattern:
  syntax: {firstname} {lastname}

It would be nice to allow specifications for interpolated and partial_match, too

[turbomam]

this can be accomplished by following the guidance about inner_keys, but maybe more documentation or examples are required.