No, this is not about any Buddhist chant or mantra that can be used to call forth Japanese gods or heavenly spirits, but rather about any specialized words or interjections that attract attention of the God/spirits that we want to communicate with. Similar to the following equivalent interjections in some languages I know:
e.g: O The Great God
Arabic: 'يا' (pronunciation: Ya)
e.g: Wahai Tuhanku
Does Japanese have such words/interjections? Even though 神様へ might be serving the purpose, へ lacks the glorification that 'O' has. Note that 'O', 'يا' and 'Wahai' are not restricted to God/spirits/heavenly beings only since they can also be used towards people, for example in a sermon, so the Japanese equivalent(s) must also have to have similar scope in order to qualify.