Thank Ihor, this did the trick! 
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Jul 14, 2022, 12:53 by yantar92@gmail.com:

> emacs--- via "General discussions about Org-mode."
> <emacs-orgmode@gnu.org> writes:
>
>> I have a quick question about parsing a string containing attributes.
>> My string has the following form
>> (setq my-string ":caption the caption :label fig-1 :width 10cm :something this is an extra option")
>> I'm looking for a function which produces an alist or plist with the option value pair.
>> (:caption "the caption"
>>  :label "fig-1"
>>  :width "10cm
>>  :something "this is an extra option")
>>
>
> org-babel-parse-header-arguments
>