How to get char indices from text parser | tsvector?

Hi all,

is there any possibility to get char "coordinates", not only token
"coordinates" from tsvector or, basically, text parser? Like in
Elasticsearch

GET _analyze?text=This fox is brown&analyzer=english
{
"tokens": [
{
"token": "fox",
"start_offset": 5,
"end_offset": 8,
"type": "",
"position": 1
}

while in PostgreSQL

SELECT to_tsvector('This fox is brown')
'brown':4 'fox':2 'is':3 'this':1

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Best Regards,
Roman Gurinovich