"It is important for me."

Translation: To dla mnie ważne.

[saucoide]

is it not possible to say: to jest wazny dla mnie ?

[luless]

To jest dla mnie ważne.

dla mnie - at the end of the sentence sounds unnatural, but probably it is correct

ważny - is masculine, so you need 'on' - he - On jest dla mnie ważny. - but it is entirely different sentence