Multichar delimiter in path_hierarchy tokenizer

At the moment, the delimiter in a path_hierarchy tokenizer must be a single

For example, something like this is not allowed :
"tokenizer": {
"arrow_path_tokenizer": {
"type": "path_hierarchy",
"delimiter": "-->"

Please, can some somebody give advice on which other tokenizer I could
to obtain the same behaviour as the path_hierarchy tokenizer but with my
"-->" delimiter ?

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