Drupal: is it posible to get the value of other fields right inside the buildForm() method withou...

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is it posible to get the value of other fields right inside the buildForm() method without having to save configuration?
I hope you found a solution that worked for you :)
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Thanks to all those great people for their contributions!

(drupal.stackexchange.com/users/109700/jorge-luis-arzola)Jorge Luis Arzola
(drupal.stackexchange.com/users/110734/yuri-gerasymov)Yuri Gerasymov
A special thanks goes out to the (https://drupal.stackexchange.com/questions/316232/is-it-posible-to-get-the-value-of-other-fields-right-inside-the-buildform-meth)Stackexchange community

I wish you all a wonderful day! Stay safe :)

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entities
taxonomy-terms
forms
configuration