Change the field type of a custom attribute

hello,

i love the flexibility of events manager and have one further question:
how can i change the field type of a custom attribute in the backend?

i created a custom attribute called #_ATT{infos} and that works fine. even managed to create a conditional placeholder for this attribute. but now i face the problem, that the input field in the backend is way too small and has just one line. actually i would love to simply duplicate the normal content editor. like that the input would be much easier.

thanks for your help and best regards
philipp

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